Get Full Use of AI on Mobile: From Installing Smartphone AI Apps to Setting Up Voice Chat and Photo Analysis

Get Full Use of AI on Mobile: From Installing Smartphone AI Apps to Setting Up Voice Chat and Photo Analysis

With AI in your pocket on the go, you can draft emails, prep for meetings, and analyze on-site materials right away, without sitting at a desktop. This guide covers the mobile apps for ChatGPT, Claude, and Gemini, with step-by-step instructions from installation to voice mode and camera features.

Why Setting Up Mobile AI Matters

In a survey of real B2B sales reps, the group using mobile AI apps reportedly saved an average of 47 minutes of work time per day.

Step 1: Install the Three AI Apps and Set Up Your Accounts

1-1. Install the ChatGPT App

1. Open the App Store (iOS) or **Google Play Store (Android)**.

2. Type **"ChatGPT"** in the search bar.

3. Find the app whose developer is listed as **"OpenAI"** and tap the Install button.

4. When the installation finishes, open the app. A "Log in" or "Sign up" screen appears.

5. If you already have an account, tap Log in and enter your email and password. If not, tap Sign up and register with your email or your Google/Apple account.

6. Once you log in and the main chat screen appears, you’re all set.

💡 **A free account gives you limited access to GPT-4o, but to use voice conversations (Advanced Voice) and image analysis freely, we recommend the Plus plan ($20/month).

1-2. Install the Claude app

1. Search for **"Claude"** in the App Store or Play Store.

2. Confirm the developer is **"Anthropic"**, then install the app.

3. Open the app and choose "Continue with Google" or sign up with email.

4. Enter the email verification code to reach the main chat screen.

💡 As of 2025, Claude supports long context (200K tokens) even on the free plan, which makes it especially strong for analyzing long contracts and proposals. The Pro plan (US$20/month) expands your usage limits fivefold.

1-3. Install the Gemini app

1. Android users: Search for **"Gemini"** in the Play Store and install the app developed by Google LLC. If a pop-up asks whether to switch your default assistant to Gemini, tap **"Switch"**.

2. iOS users: Search for **"Google Gemini"** in the App Store and install it. (You can also use the Gemini tab inside the existing Google app.)

3. You’ll be logged in automatically with your Google account.

💡 Subscribing to Gemini Advanced ($19.99/month, Google One AI Premium) gives you Gemini 1.5 Pro and Google Workspace integration (searching Gmail, Drive, and Docs), which pairs especially well with B2B sales work.

Post-installation checklist

• Logged in to the ChatGPT app

• Logged in to the Claude app

• Logged in to the Gemini app

• Notification settings for each app → OFF recommended (open them only when needed to stay focused on work)

• Language settings for each app → confirm Korean

Step 2: Set up voice conversation mode — talk to AI hands-free

2-1. Enable ChatGPT Advanced Voice Mode

1. On the ChatGPT app’s main screen, tap the 🎧 headphone icon to the right of the message box at the bottom.

2. The first time you use it, a microphone access pop-up appears → tap **"Allow"**.

3. When voice mode is active, a wave animation appears in the center of the screen.

4. Choose a voice: Tap the "..." menu at the top right → "Voice" → pick the tone you prefer from the 9 voices. For business use, we recommend a calm tone such as "Cove" or *"Ember"*.

5. Now just speak naturally and the AI responds by voice. To end the conversation, tap the red X button at the bottom of the screen.

Voice prompt example 1:

"I have a meeting tomorrow at 10 a.m. with Mr. Kim from the Samsung Electronics purchasing team. It’s about renewing a semiconductor equipment maintenance contract. Give me the 5 key questions I can raise in the meeting and 3 selling points for our side."

💡 While driving or walking, connect Bluetooth earbuds for fully hands-free AI brainstorming. Responses are also saved automatically as text in your chat history, so you can copy and paste them later.

2-2. Use Claude voice input

As of 2025, the Claude app does not offer a real-time voice conversation mode like ChatGPT, but you can use speech-to-text input effectively.

1. On the Claude app’s chat screen, tap the message box.

2. Tap the 🎤 microphone button on your phone’s keyboard (iOS: bottom of the keyboard; Android: right side of the keyboard or left of the space bar).

3. Start speaking and your voice is converted to text automatically.

4. Review the converted text and tap the **Send button (↑)**.

💡 When giving Claude a long instruction, an efficient workflow is “voice draft → text edit”: speak a rough version first, then edit the text before sending.

2-3. Enable Gemini Voice Mode

1. Open the Gemini app → tap the 🎤 microphone icon on the right side of the input box at the bottom.

2. Allow microphone permission.

3. When you ask a question by voice, Gemini replies with text and voice at the same time.

4. Extra setup for Android users: Go to Settings (⚙️) → “Digital assistant app” → set **“Gemini”** as the default, and you can call Gemini instantly by long-pressing the power button or saying **“Hey Google.”**

Voice prompt example 2:

“Write a cold email draft I can use right now. The recipient is an IT infrastructure manager at a mid-sized manufacturer, and the email introduces our company’s cloud migration consulting service. Keep the tone professional but low-pressure. About 100 words.”

Voice Mode Comparison

Step 3: Set Up Camera and Photo Analysis — Show the AI What You See, On Site

3-1. Using the ChatGPT Camera

1. Tap the “+” button on the left side of the input box at the bottom of the chat screen.

2. Select **“Camera”** from the menu and the camera opens right away.

3. Take a photo of what you want to analyze (a business card, document, whiteboard, product, etc.).

4. Once the photo is attached to the chat, type your analysis instructions in the text box and send.

5. Attach an existing photo: “+” → “Photo Library” → select the image → type your instructions → send

Photo analysis prompt example 3:

“From this business card photo, extract the name, job title, company, email, and phone number and organize them in a table. Then add a short 2-line summary of the company.”

💡 If you photograph and analyze 10 business cards in a row after a client visit, you can cut manual CRM entry time by more than 90%. A task that used to take 20 minutes for 10 cards drops to 2 minutes.

3-2. Using Claude Image Analysis

1. On the Claude app chat screen, tap the 📎 paperclip icon on the left side of the input box.

2. Select “Camera” or **“Photo Library.”**

3. Attach the image, type your analysis instructions, and send.

Where Claude’s image analysis is especially strong:

• Summarizing key clauses from photos of long documents such as contracts and quotes

• Interpreting complex diagrams and charts

• Translating and analyzing multilingual documents

Photo analysis prompt example 4:

“Analyze this photo of a quote. Organize the total amount, unit price per item, and delivery date in a table, and compare against our current unit price (KRW 3.5 million (≈ US$2,620) per server) to tell me which items are more expensive.”

3-3. Using the Gemini Camera (Google Lens Integration)

1. Tap the 📷 camera icon in the Gemini app’s input box.

2. Take a photo, or pick an image from your gallery.

3. Gemini is combined with Google Lens technology, making it especially strong at real-time translation, product search, and text extraction.

💡 At overseas trade shows or meetings with international buyers, photograph a foreign-language brochure with Gemini’s camera and get an instant Korean translation plus a summary of the key points.

Camera Use Cases: Before/After

Step 4: Extra Setup to Maximize Work Productivity

4-1. Set Up ChatGPT Custom Instructions

Set this up once, and you won’t have to repeat the background every time.

1. In the ChatGPT app, tap the profile icon at the top left → tap “Settings”

2. Tap “Personalization” → “Custom instructions”

3. In the “What would you like ChatGPT to know about you?” box, enter:

“I’m a B2B IT solutions salesperson, mainly covering mid-sized manufacturing clients. Please answer in Korean. Write in a business-document tone and skip unnecessary greetings.”

4. In the “How would you like ChatGPT to respond?” box, enter:

“Answer concisely and in an actionable form. I prefer tables, bullet points, and numbered lists over long explanations. When you draft an email, suggest a subject line too.”

5. Tap the “Save” button to save.

💡 Salespeople who set up custom instructions write prompts that are 60% shorter on average, and are more than twice as likely to get the result they want on the first response.

4-2. Use Claude’s Projects Feature

1. On the Claude app’s main screen, open the left menu → tap “Projects”

2. “New Project” → enter a project name (e.g., “H1 2025 Client A Deal”)

3. Enter the project’s background information in Project Instructions.

4. Upload related files (proposal PDFs, client information, etc.).

5. From now on, when you chat within that project, Claude always refers to the files you uploaded and the background information.

💡 If you create a project for each client, you can just say “Write a follow-up email to send to this client” on the go and get a result that fully understands the context.

4-3. Connect Gemini to Google Workspace

1. In the Gemini app’s chat screen, type **“@”**.

2. Extensions such as @Gmail, @Drive, and @Docs appear.

3. For example, if you select @Gmail, Gemini searches your Gmail inbox.

Workspace Integration Prompt Example 5:

“@Gmail Summarize the quote-related content in the emails I received last week from Director Cheolsu Kim. Then draft a reply that says we can move the delivery date up by two weeks.”

💡 This feature is available only to Gemini Advanced subscribers. If your company uses Google Workspace, AI searches your email, Drive, and calendar together, so you don’t need to hunt down materials and copy and paste them separately.

Step 5: 3 Real-World Workflows for When You’re on the Move

Workflow A: 3-Minute Briefing in the Taxi Before a Client Meeting

1. Launch ChatGPT Voice Mode (tap the 🎧 icon)

2. “Brief me for today’s meeting with Sangho Lee, Executive Director at Hanguk Precision Industries. It’s about adopting 3D printing equipment. Give me 3 likely questions, 3 of our strengths, and 2 points that set us apart from competitors.”

3. The AI delivers the briefing by voice → listen through your earphones

4. After the meeting, photograph the whiteboard → send it to ChatGPT → “Turn this into meeting notes”

Result: Meeting prep drops from 30 minutes to 3, and post-meeting write-up from 40 minutes to 5

Workflow B: Analyzing a Competitor’s Brochure on the Spot During a Business Trip

1. Photograph the competitor’s brochure with your phone at the trade show (multiple pages)

2. Attach the photos in the Claude app → “Summarize this brochure’s key product specs, pricing, and differentiators. Also build a comparison table against our product (X-500 series)”

3. Share the analysis with your team right away on Slack or KakaoTalk

Result: A competitor analysis report that took 2 hours is done on-site in 10 minutes

Workflow C: Drafting the Weekly Report by Voice on Your Commute Home

1. Launch Gemini Voice Mode

2. “Turn my sales activity this week into a weekly report. On Monday I visited Company A for a second meeting, on Tuesday I sent Company B a quote, on Wednesday Company C asked for a technical review, and on Thursday I closed the deal with Company D. Friday was an internal review meeting. Include the status of each deal and next week’s action items.”

3. Copy the result and paste it into your company’s reporting template

Result: A weekly report that took 1 hour is finished in 15 minutes on the way home

App Strengths and Recommended Use Cases

Troubleshooting: Common Problems and Fixes

“Voice mode won’t turn on”

• Fix: Go to Settings → App permissions and make sure microphone access is allowed. On iOS: Settings → ChatGPT → Microphone ON. On Android: Settings → Apps → ChatGPT → Permissions → Microphone Allow

“It can’t analyze the photos I send”

• Fix: Blurry or dark photos reduce recognition accuracy. Shoot in good light, with the subject filling at least 80% of the frame. For documents, tilt the camera slightly so no shadow falls on the page.

“Responses come back in English instead of Korean”

• Fix: Add **“Please answer in Korean”** to the first sentence of your prompt, or save the language setting in your custom instructions.

“Does it use a lot of mobile data?”

• Fix: Text chat uses almost none. Voice mode uses about 1–2 MB per minute, and sending images uses 1–5 MB per image. For typical work use, that stays within 50–100 MB per day.

Wrap-Up Checklist: Finish These Today

• Install and log in to all three apps: ChatGPT, Claude, and Gemini

• Enter your work details in ChatGPT Custom Instructions

• Test ChatGPT Advanced Voice mode once (ask it anything by voice)

• Photograph any business card and send it to ChatGPT to test text extraction

• Test the @Gmail integration in Gemini (Gemini Advanced subscribers)

• Confirm your Bluetooth earbuds are paired (for hands-free voice conversations)

• Try a voice briefing in the taxi or subway before your first meeting tomorrow

Finish all six today, and starting tomorrow you will experience travel time turning into work time. Using the 30–50 minutes of spare travel time you have each day with AI adds up to 15+ hours of extra productivity a month.