My iPhone 4s says No Service in upper left hand corner. what do I do?

[iMore Question]

my iphone 4s says " No Service" in upper left hand corner. what do i do?'

it wont even let me call my service provider or anyone.Please help

 

[kch50428]

Re: my iphone 4s says " No Service" in upper left hand corner. what do i do?'

Because you don't have any connection to a cellular network... you'll have to go where you can get signal... or use a landline to call your provider's customer service.