This can happen if the recharge PINs are missing or the PIN has already been used. To check this, please provide the Inkk mobile number you’re trying to recharge, the recharge serial number, and at least five visible PIN digits in the correct order (e.g., 12x3 xx6x 9xxx). If you need to confirm whether the PIN is invalid or already used, we’ll also need the full 12-digit PIN and the status of your Inkk SIM. Dial *442# and follow the on-screen prompts to check account status