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Hello Som Maneth,

Diafaan SMS Server does not have specific functionality to add SMS credits to a SIM card. Every mobile operator can use its own method to manage the SIM card credits so there is no universal way to implement such a function in software like Diafaan SMS Server.

Some mobile operators accept USSD commands to add SMS credits to a SIM card and Diafaan SMS Server supports simple USSD commands. But if your mobile operator does not support this then it is not possible to add SMS credits from Diafaan SMS Server.

Regards, Henk