Why is my LG F180K showing Service Disabled on my lockscreen?

A

AC Question

I've been facing the issue with my LG F180K i.e it is showing Service Disabled if if SIM card is inserted. Sometimes it show No Service status. Signal bar is showing nothing with a small redcross over it.Network status are as follows:

Network: Searching for Service
Signal Strength: 0 dBm 0 asu
Mobile Network type: Unknown
Service State: Out of Service
Mobile Network state: Disconnected.

Meanwhile Sim card is already inserted in it.
My phone is running on Android 4.4.2 with Sling rom (rooted). I've also visited several android repair shops but no luck plus there is no hardware issue at all. Please help me out of this trouble.
 

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