Bharat Sanchar Nigam Limited (BSNL) is the 4th largest telecommunications company in Asia and 7th largest globally, providing GSM and basic telephony services in India. It has over 3 lakh employees. BSNL offers wireless local loop (WLL) services, including fixed and portable WLL, using radio frequencies to connect to the public switched telephone network. Key features include dynamic locking of STD/ISD calls and call waiting/forwarding. The summary provides an overview of BSNL and its WLL services.