What can I do about a flimsy phone case that keeps falling off?

You can come in. You can see what's going on with your phone. Since you said you have data, there wouldn't be anything that we can do besides looking at your mobile data if you go into your settings. But if not, you'd have to come into the store.

Did you download the update with your phone data or did you download it off of Wi-Fi?

You should double-check your data, because this is all the workings of not having data on your phone. I understand that you bought data, but you should double-check with your service provider and ask them how much data you have left.

For the replacement, you'd have to get it from them. If you bought it from us, then we'd be able to give you the replacement. Since it's from them, you'll have to get it from them.