Why is my signal cutting out after I've dialed?

[AC Question]

Ive had an LG G3 for about 6 months now. I havent experienced this problem before but has started today. Pretty much, the signal cuts out as soon as the phone starts dialing. It comes up with an error stating "no network" and then it ends the call. I also cant receive calls. The wifi works fine, and also the mobile network internet, which leads me to believe this is a problem with the software. Im running lollipop btw.

Help please. This is literally the only way i keep in contact with a lot of friends and family still.

Also, im in the UK, and on 3 network

 

[Rukbat]

Go to 3 and ask them to check it out. It could be a bad SIM card (which they should replace for free) or it could be that your account settings got messed up.