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When subscribing via @PremiumBot, the currency and price of your first month of Premium is based on the phone number of your Telegram account. After this initial payment, all future payments are calculated for the default currency of your payment method.
+When subscribing via @PremiumBot, the currency and price of your first month of Premium is based on country code of the phone number of your Telegram account. After this initial payment, all future payments are calculated for the currency of the country of your payment method. (E.g., if your card was issued by a bank in the UK, the payment will be in GBP.)
In order to qualify for localized pricing, your payment method must be issued by a financial institution in that country and have a local billing address.
If you subscribe via the Play Store or App Store, your currency will be based off your account with Google or Apple.