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The issue where the phone shows "No service" on the lock screen even though you have a working network reception is fixed in the next software update. The issue is fixed in 23.1.A.0.726 but depending on where you bought the phone you may not have received this update yet.
So you have network coverage even if it says no signal?
No,as far as I am aware. Can you boot in safe mode and see if the same occurs?
/t5/FAQ/How-to-boot-your-phone-into-safe-mode/m-p/348008#U348008
Is it affer the lolipop update? If yes its a bug which i experienced after turning my device on. Turn on airplane mode and turn it off
thank you
Anytime 
Ah good to know its fixed, im getting annoyed that every time i power my phone on it says no service. When can i expect the update in poland?