Why is my phone showing 'no service'?

I

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my phone is showing 'no service'

phone worked ok this morning for a imessage but now i cannot either make or receive calls, text, upload call time.
I have a pay as you go, and am with o2.
yesterday - i could not recevie or make calls and I reset a counter on my settings but the 'no service' message is new
 

bamf-hacker

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Re: my phone is showing 'no service'

Try to reboot the device and if that does not work I would contact O2 to check your account.