@AshimNath The issue was happening with all the available SIM cards. My device was under warranty, therefore, TP_Link replaced the item with a new device. Thank you.

@Sunshine HI, Yes it's possible that the item was faulty as I only used it not more than 3 weeks. I contacted the TP-Link customer support, they're now replacing the faulty item.

@Sunshine Thank you for Reaching out. I do not know the model number of the sim card it only has the serial number printed, these are Jio 4G Sim, Airtel 4G Sim, BSNL 3G Sim. Both Jio and Airtel 4G...

I bought the "TP-Link Archer MR200 AC750 " from Amazon on 11-Jul-2020, it worked very well until now. After coming from one week vacation, I started the router again and I do not see any LTE/3G/2G...