Set up 4G Module Phone: from modem preparation to your first call

Start with your modem’s current state

What you need

• A first-generation DJI QDC507, the currently tested model. Other Cat4 modems, the second generation, and similar-looking devices are not automatically compatible.
• A working SIM with the services you need: voice for calls, SMS for texting, and an active data plan plus the correct APN for internet access.
• A USB-C iPhone or iPad, a reliable data connection, and an App Store account that can download the app. Check the store listing for current OS requirements.
• A computer for initial modem preparation. The existing deployment procedure was mainly verified on Mac. Once prepared, everyday direct USB use does not need a running computer.

1. Have WorkBuddy inspect the device first

Download the ZIP and import it through your WorkBuddy client’s supported Skill import method. Give it this task and have it read SKILL.md before making changes.

Use the module-phone-install Skill to prepare a USB modem for 4G Module Phone. Read SKILL.md and identify the model, installed service, and computer environment first. Do not touch other devices or upload SIM information or keys. Prefer inspection and updates on prepared devices, preserving existing data. Verify connection, calls, SMS, and data separately.

2. Prepare the modem’s companion service

Follow the Skill to identify the specific modem, back up its configuration, and verify the compatible service files with SHA-256. Explain the effects and get the owner’s authorization before enabling debugging, installing boot entries, or changing modem settings. Keep power connected.

The public download contains no private pairing keys, SIM/eSIM profiles, customer messages, Apple signing files, or generic firmware image. If service files are missing, stop after preflight and obtain compatible files from your provider.

3. Install the app and connect your iPhone or iPad

1. Check the currently available version and region in the App Store and install the app. The website ZIP is not an iOS installer; no unsigned, directly installable IPA is provided here.
2. Insert the SIM into the prepared modem and connect it directly to your USB-C iPhone or iPad. Keep the device unlocked.
3. Open 4G Module Phone. Allow Local Network and microphone access when needed. Keep the app in the foreground and allow about 1–2 minutes after a cold start.
4. Version 1.0.1 with the updated modem service connects automatically without a pairing code or owner binding. Version 1.0.0 uses the earlier connection flow; follow your provider’s connection instructions until 1.0.1 is available to you.

4. Verify each feature, beyond “connected”

Calls

Call an authorized ordinary test number and check that both sides hear clearly. Then test incoming calls, answering, mute, hangup, and a second call.

SMS

Send a test SMS from another phone to the modem’s SIM and reply from the app. Data or voice working does not establish that SMS works both ways.

Data

After configuring modem data, disable Wi-Fi and other internet paths on the test device, open a page to verify cellular access, then restore the original network. This uses your SIM’s data.

Reconnection

End the call, unplug the modem, reconnect, and check it reconnects. Verify permissions and versions when moving it to another device.

Check the layer that is failing