The professional hub for digital signage industry, connecting hardware, software, and content ecosystems. Share knowledge, explore opportunities, and shape the future of DOOH media.
Does the 4G module support voice calls?
After testing with SIM cards, the device shows network initialization but cannot make or receive calls or SMS. The SIM is detected only after opening the phone app, and behavior varies depending on whether a PIN is set.
Our technical team provides system re-signing and repackaging services —
we'll repackage your app using GZY's system signature, enabling the required system-level privileges so your software functions smoothly within the Android signage environment.
Result:
✅ Access to system APIs
✅ Seamless software-hardware integration
At GZY (www.eellnet.com), we don't just ship hardware — we ensure your applications run perfectly on it.
From firmware customization to APK system signing, our engineers make sure every detail aligns with your project's technical needs.