I never had any issues until ios7. It happened as soon as I updated, so it has to be a software issues. From what i can see, people who have this issue are all 4s users. This shouldnt mean a hardware issue, but that the 4s is incompatible with ios7!
Regarding recent ios6 upgrade.. I hadnt upgraded so I wouldnt know what that would have done to my phone, but it cant be acceptable. I cant do everything on cellular network. It costs too much.Smartphones should have wifi, especially for travelling!
Are you really accepting that as an excuse... hardware issue.. get a new phone?!
Fair enough... after 4 iphones Ive been quite curious what the fuss over Samsung is all about....