Whether you’re a new or existing mobile network subscriber, staying up-to-date with the latest ussd codes can help you save money and get bonuses while enjoying seamless communication and connectivity.
To read the full post https://www.vtupdatez.com.ng/2023/07/all-new-ussd-codes-for-mtn-glo-airtel.html
Here are the list of USSD code by operators;

MTN
For airtime recharge, *311* Voucher PIN #
To check MTN airtime balance, *310#
To buy data, *312#
To check your data balance, *323#
To share data, *321#
MTN hot deals, it still remains *121#
To borrow airtime, *303#
For MTN Value-added Services, *305#
To link your NIN to your MTN line, *996#

Airtel
For airtime recharge, *311* Voucher PIN #
Airtime balance, *310#
To borrow airtime, *303#
To buy data, *312#
To share data, *321#
To check your data balance, *323#
For Airtel Value-added Services, *305#
To link your NIN, *996#

9mobile
For airtime recharge, *311* Voucher PIN #
Airtime balance, *310#
To borrow airtime, *303#
To buy data, *312#
To share data, *321#
To check your data balance, *323#
For 9Mobile Value-added Services, *305#
To link your NIN, dial *996#

GLO
For GLO airtime recharge, *311* Voucher PIN #
To check airtime balance, *310#
To borrow airtime, *303#
To buy data, *312#
To share data,*321#
To check GLO data balance,*323#
For GLO Value-added Services, *305#
To link your NIN to your GLO line, *996#

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for more info, learn more on the List Of All New USSD Codes for MTN, Airtel, Glo & 9Mobile



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Thanks for the info, helpful!