My mobile sim signals is not working properly?

[AC Question]

Hy I have HTC one m7. It's already rooted and sim card slot work fine. some time signal appear or disappear. I already checked this on lowest 2g mode but not its working while signal strength is perfect in our area.
Give me some solution how to fix it?

 

[nahoku]

Visit your carrier store and get a new sim, or at least have them check the one you have.