Full Signal to no service - iPhone 5s

[Anonymous]

I have had my iPhone 5s for a year now, and recently it started dropping from full signal in my home to no service. I have had a new sim sent out and have swapped it over but still the same problem is occuring. Even when it occasionally shows I have signal, all calls I make say "call failed", and I can't send texts either. I recieved a text from o2 about my new sim around 16 hours after they sent it. I have also reset my phone to factory settings, and downloaded iOS9 again via my computer, ruling out there was a problem with the update.

My phone is on contract, I have no insurance and no extended warranty. Will I have to pay for a new phone?

[Cleoriff]

Hi @Anonymous Have you checked your network signal here?

http://status.o2.co.uk/

Also a self help thread from one of our members @adamtemp64

http://community.o2.co.uk/t5/Pay-Monthly-and-Pay-Go/Self-help-guide-Is-the-network-down-for-me-or-everyone/m-p/593752#M59833

Not sure if your phone is over a year old but giving Apple a ring may be of some help..

https://www.apple.com/uk/support/contact/

[MI5]

Is this just at home or everywhere?

[PhoneChanger]

If you live local to an Apple store just call in to the genius bar and they will be able to run some diagnostics to determine if it is a fault on the handset

[adamtemp64]

is your local area being upgraded to 4g ?

or you could be on a fringe area try manually selecting 2g then 3G then 4g to see if you hold a stable 2g/3G/4g connection etc