Visit your nearest BSNL Customer Service Center, BSNL office, or authorized retailer
Ask for a BSNL 5G-ready SIM or SIM upgrade
Carry valid KYC documents such as Aadhaar card, PAN card, passport, voter ID, or driving license
Complete the SIM replacement or new SIM activation form
Provide biometric verification if required
Ensure your mobile handset supports 5G
Check that 5G service is available in your area
Keep your BSNL number active if you are upgrading from an existing SIM
Wait for SIM activation after verification
Insert the new SIM and restart your phone
Enable 5G or preferred network mode in your phone settings
Contact BSNL customer care if the SIM is not activated or 5G is not working