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1Clear out junk files and repair common Windows errors2Fix the driver behind crashes, sound loss and screen glitches3Repair Windows errors before they cause bigger problemsIf your BSNL SIM has no service after you ported your number, first check the porting schedule SMS and allow the scheduled transition to finish. TRAI says the change takes place at night and service may be interrupted for up to four hours. If service still has not started after that window, contact BSNL GSM support rather than assuming a particular fault.
Check whether the port is due or still in progress
Porting does not necessarily happen as soon as you submit a request. TRAI says the expected time is 3 working days for a port within an LSA (Licensed Service Area), 5 working days between LSAs, and up to 15 working days in Jammu & Kashmir, Assam and the North East LSAs. These timeframes appear in TRAI’s FAQ, displayed as updated 8 October 2026; the modified FAQ PDF is dated 30 September 2024. See the TRAI Mobile Number Portability FAQ and its modified FAQ PDF.
Look for the SMS that gives your port schedule and check that its date and time have passed. TRAI says subscribers receive SMS updates at key stages, including the schedule, deactivation by the old operator and activation by the new operator. Keep these messages available if you need help.
What to do when the scheduled switch arrives
- Wait for the scheduled time. The number transfer takes place during night hours, not necessarily at the moment you receive a status message.
- Insert the new SIM supplied by BSNL. TRAI’s guidance is to insert the new SIM; the number becomes active on the new provider’s network after verification. Activation is not guaranteed to be immediate when the old SIM stops working.
- Allow for the interruption window. TRAI says the scheduled change can leave you without service for up to four hours. A temporary loss of signal within that period does not by itself establish that the port has failed.
If your BSNL SIM still has no service after four hours
If the scheduled change has passed and the maximum interruption window has elapsed without service, contact BSNL GSM support. Use the number that matches the line available to you:
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BSNL also provides an online complaint form. When contacting support, have your port schedule and status SMS messages ready. They can help support check the stage of the transfer; the official guidance does not identify a specific cause for an individual subscriber’s missing service.
If you were told the port request was rejected
A rejection is different from a completed port with no service. TRAI says the subscriber should receive an SMS stating the reason for rejection. Its listed UPC eligibility conditions include having the current number activated on the existing operator’s network for more than 90 days, clearing applicable postpaid dues, having no ownership-change request in progress, and allowing seven days to pass after a SIM swap or replacement. Check the rejection message and resolve the stated issue with the relevant operator before submitting another request.
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TRAI says a UPC is generally valid for four days; in Jammu & Kashmir, Assam and the North East LSAs, it is valid for 30 days. The day the code is generated does not count toward that validity. After submitting the request, the recipient SIM is collected from the new operator’s service centre or point of sale. These rules and timings are described in the TRAI MNP FAQ.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What the available information cannot diagnose
The published porting procedure and support details do not reveal whether a particular phone has coverage at your location, whether its settings or compatibility are suitable, whether the account or KYC needs attention, whether the SIM is damaged, or whether BSNL has completed backend provisioning for your number. Those require checking your situation with BSNL support; the title alone is not enough to identify the cause. A recharge, new handset or signal booster is not established by the cited guidance as a remedy for a port that has not activated.
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