What causes the iphone 4 to go into "No service"

[Alag28]

i mean other than the most blatant reason "it has antenna problems" why did my ip4 go into no service and i had to turn off the phone and turn it back on to get back service?

is there a concrete explanation of this weird phenomenon?

 

[Applejuiced]

At&t

 

[frunkis54]

At&t

but at&t has the best service blah blah blah

 

[netdog]

It happens with O2 here in the UK too. I think it just can't find a signal, and hence says no service. Simple as that.

 

[Alag28]

It happens with O2 here in the UK too. I think it just can't find a signal, and hence says no service. Simple as that.

but where it just happen (my university lobby and service is available steadily) my fone just kinda locks into "no service"

 

[shmeaty]

At&t

+1. Truth.

 

[star19man]

i mean other than the most blatant reason "it has antenna problems" why did my ip4 go into no service and i had to turn off the phone and turn it back on to get back service?

is there a concrete explanation of this weird phenomenon?

I'm in Belgium and I have exactly the same problem. Bumper doesn't help at all. Not sure what to do..