There's has been an outage due to some maintenance work with network Three and IDMobile. Hopefully you'll be reinstated soon there has been a few post on here about the same problem. 

Same problem here in Manchester, no signal no connection at all. Very frustrating especially when data is needed for sat nav

Look like everyone else I had the same problem. Some customer have some or all services reinstated 

Hi @estrella & @Tregan Ru 

Hey there, we're very sorry for any disruption, we are aware of the issue/outage and we are currently working on this as a high priority. We hope to have this resolved as soon as possible. Thank you for your patience with us.

Tom