15-05-2012 06:47 - edited 15-05-2012 06:48
SMS messages are maximum 160 characters just like it is when sending from mobile phones. If you exceed this amount then it will be charged as multiple messages.
For example if you write 180 characters then you will be charged for 2 messages.
One messages to Thailand is 6.3 cents and two messages are 12.6 cents.
Further info about this can be found here:
Let me know if you need any further details.
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