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Ringtones cost a few dollars and it is difficult to collect small sums over the Internet - and often avid buyers of ringtones don't have credit cards. |
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Regular users of your SMS service will have an account and you can charge ringtones directly to their account. |
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Advertising and Marketing organisations will usually want to send out thousands of ringtones at a time and a web based service can be very convenient for them. |
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