Okay, I don't have the
Nokia ONT. I have a
Huawei one, which had poor range but was a good modem. The range became extremely poor recently and it started throwing devices off the network, so I got my own
router.
If you're getting good speeds over LAN, maybe you should contact Airtel and see if they can replace the modem. The ISP provided ONT + router combos are almost never good.