Decide what must survive
If the number matters, plan its transfer before closing the old service. Keep account access long enough to retain documents and complete security checks.
Confirm the final position
Ask about remaining term, early termination, handset balance and equipment return. Ending airtime may leave another obligation in place.
Complete the actual process
Use official cancellation or the receiving network’s switch route. Keep confirmation, return evidence and the final statement. Removing an application, deleting a profile or stopping payment is not by itself a valid cancellation instruction.