lemfo lem6 smartwatch network problem in India

I purchase lemfo lem6 smart watch in India. I use airtel sim card in my watch, when i search signal it shows airtel signal but when i select network it shows can not connect to this network right now try again later, but when I use same sim in my mobile it works fine. please suggest solution

No IDEA.:rofl::rofl::rofl::joy::rofl:

(sorry, couldn’t resist)