My previous phone was a Galaxy Nexus running CM11 on the T-Mobile (UK) PAYG network. If I travelled any distance it would eventually lose it's mobile data connection. I'd still have a mobile signal so could make calls but I couldn't access the Internet. To get the mobile data back I'd have to switch aitplane mode off & on, but even that sometime wouldn't work and I'd have to reboot the device.
I'd read reports of similar issues with the GNexus, and tried flashing various radios with no change, so I figured it was purely an issue with the device itself.
But, I fairly recently changed to a Moto G (16GB, from Tesco but currently running GPE) and was still getting the same issue. So I started thinking that it might be a T-Mobile issue, maybe something related to the EE merger and, as I had an original T-Mobile SIM, the cell tower negotiation failing. I contacted T-Mobile about this but they weren't much help.
I'd been with T-Mobile for a long time and figured it was time for a change anyway so I've switched to GiffGaff, thinking this should finally resolve the problem. Unfortunately I'm still getting the mobile data dropping!
So, I've swapped phone AND network and I'm still losing my data connection
I'm out of ideas so any suggestions would be appreciated.