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Payment gateway system:- worldremit
Payment methods:- debit cards, credit cards, bank transfer.
You can see that custom reviews based on trustpilot.com so you don't need worry . Service available 24/7 so that it's possible to recharge your mobile phone any time.
How to recharge (instructions )
Log on to worldremit.com , there you can see some list of countries in the world, select your country and then select you operator you want to recharge. If you pay money using cards , it wil be very quick than bank transfer.