My Lumia 1520 is giving me SIM error msg. I've replaced the SIM and stil same msg?

[Windows Central Question]

Phone was operating fine 2 minutes prior, then out o the blue... Any suggestions? would be greatly appreciated, as it's a long weekend and I don't have a back up phone.

 

[0jonadams]

My lumia 920 did that regularly for a while. Just had to restart the phone to get it to come back. I took the sim out and cleaned the contacts and the hole the sim card goes in and it stopped doing it.

Hope that helps.