In what case does a mobile customer require BSNL SIM card for replacement, It is either for SIM lost (mobile theft) or SIM not working cases, For the first instance, nowadays, many cell phone manufacturers BSNL SIM Card are offering General Insurance, but it is at the time of purchasing the new cell phone. In what case does a mobile customer require BSNL SIM card for replacement, It is either for SIM lost (mobile theft) or SIM not working cases, For the first instance, nowadays, many cell phone manufacturers are offering General Insurance, but it is at the time of purchasing the new cell phone.