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If international roaming is active on your account, and you are unable to make or receive calls, it suggests that our roaming partner in Thailand doesn't have coverage in the part of the country you are in.
International roaming is something that we leave on once it is activated, unless you ask us to remove it. If you want to confirm that international roaming is active on your account, please have a chat with us directly here: http://tel.st/49kl