How do I stop Sonim XP7 from supplementing a poor wifi signal with cellular data? The wifi on Sonim is poor from the beginning and the phone always kicks in the cellular data to "top up" the poor wifi signal. This has been sending me over my data limit ever since I got the phone. I-phone does the same thing but at least there you can turn this off.
Here's what you can do, go to Settings > Data > double press Recent key > choose Restrict app background. Let me know if that's what you're looking for.