I’ve found with some jailbreaks, including iOS 13.3 and unc0ver, that I’ll be trying to use wireless service with my provider T-Mobile and I’ll get the following error message “ Could not activate cellular data network” and my mobile data won’t work.

Fortunately, Luca Todesco’s fix still works! I found a way to shorten it if you’re jailbroken:

1. Download MTerminal with Cydia or connect to your phone via SSH.
2. Open MTerminal (or make a SSH connection), type the command “su”, tap the “return” key, enter “alpine” for the password, finally followed by “return” again.
3. Enter the following commands and press return after each line:

chmod 777 /var
chmod 777 /var/mobile
chmod 777 /var/mobile/Library
chmod 777 /var/mobile/Library/Preferences

That’s it! I didn’t even have to restart my phone.

Others out there say they’ve uninstalled TetherMe to fix this issue, but this had no effect for me.