Mobile Phone Service Provider lian Bharat Sanchar Nigam Ltd chuan tunhnai khan Customer  leh Postpaid Retailer ten Mobile phone talktime, data leh service an neih zing a mi Customer  leh Postpaid Retailer ten Mobile phone number chhu luta an hriat zung zung theih nan  dial *121#, *121*customer mobile number# leh *121*1#  hman theihin an hawng thar a ni.