There’s no difference: you can buy your ticket by SMS regardless of whether you use prepaid cards or have a contract.
With these systems (prepaid cards) the price of the SMS-ticket is deducted from your call credit.
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.
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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