/members/james77/There is no compulsion that you should use MTNL supplied modems only.If you can use any other modem and connect to Internet, surrender the modem ( if taken on rent). Get a written receipt. Then you save modem rent. In case you have problem in Internet connection MTNL will blame the modem for the fault !If you had purchased it , take action as you like. Keep it as standby, or sell it , or donate it ( Me ?!!!!).