Mine is doing the same. It has come to the point that i now turn my data off when i dont need it. I have tried forcing stop on some of my apps as i am wondering if something is updating and running in the background. But when you have so many its ...
Can the other phone call providers call her? We have had the same issue at times, it can also be poor reception. Check you have signal bars on the phone. Sometimes also certain numbers says i cant call them ( like my Dr's office) but when i google...