The USSD codes *312*88# and *312*100# are typically associated with specific promotional data offers on the MTN network in Nigeria, not Airtel. These are usually special, heavily discounted plans (e.g., 1.5GB for N200) that are only available to eligible customers, a condition set by the network provider.
If you are unable to subscribe to these offers, it means your line does not currently meet the specific eligibility criteria set by MTN.
What you can do:
Understand Eligibility is Key: These are not general public offers but rather targeted promotions (like a win-back offer for dormant SIMs, or specific rewards based on usage patterns/tariff plans). You cannot force eligibility.
Dial the Main USSD Code: For general data purchases, you can always dial the main MTN data code, *312#, to see all the plans your line is eligible for at the moment. This menu will show you the standard and any other available special offers.
Check via the App: Download and use the myMTN app. Sometimes, different offers are available through the app's "MegaDealZone" feature that might not be on the USSD menu.
Try Other MTN Codes for Offers: You can also try dialing *121# to access other potential tailored offers on the MTN4Me menu.
Consider a "Win-Back" Strategy: Some users have reported becoming eligible for similar offers after their SIM card has been inactive (no chargeable activity) for a certain period (e.g., 30-60 days). This is not a guaranteed method, but it is a common factor in eligibility for such heavy discounts.
Contact Customer Care: If you believe there is an error, you can contact MTN customer care by dialing 300 to inquire about offers specific to your line. They can confirm the offers your line is eligible for.
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