Andy,
We are not requesting an SMS service in depreciation of the Mobile Callback. Both have their advantages. Nice for you that your operator offers accessible roaming costs, that is not the case with the majority of contracts. Getting another SIM just for using GPRS abroad is not really an option for most people.
Mobile Callback alone would not help you much if your are for instance roaming in a country without GRPS coverage or roaming agreements for data transfer. On the other hand, every network will accept SMS.
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