There’s no difference: you can buy your ticket by SMS regardless of whether you use prepaid cards or have a contract.
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Prepaid systems
With these systems (prepaid cards) the price of the ticket via SMS is deducted from your call credit.
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Postpaid systems
With mobile phone contracts or tariff plans, the amount due is communicated to the customer in a statement and added to the mobile phone bill.
Note
Bear in mind that you must not have blocked premium services.
These are calls to 090 and 070 numbers and messages from/to special 4-digit numbers that offer paid services (such as games, newsletters, competitions, chat services, etc.).
If you have a block like this in place, contact your phone operator's help line.
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