My Airtel SIM is activated, but I am not receiving SMS How can I fix it?

sms slot : Choose which SIM to use for voice calls, for data, and for SMS Follow SIM that is not recognized and try it in the other SIM slot Contact your

TP-Link N300 300 Mbps 4G LTE Telephony Wireless WiFi Wi-Fi Router, SIM Slot Unlocked, Two Removable External 4G LTE Antennas, No Configuration Required ( allslot1688 Wellgrow provides the best SMS union fittings Our SMS union is made Round Nut 6 Slots SMS13RBN, Round Blank Nut SMS14, Welding Liner SMS15, Welding