This is a most likely a problem with...
A) Your wifi. Try resetting your phone and wifi network and try again.
Or
B) Your phones "App Store" the IOS AppStore, and androids google play work fine for everyone else, are you on a different type of phone.
Keep us updated on the situation so we can help.
Godspeed on your travels.
Simply put, my job here is to keep the forums afloat through any means necessary