You do not need to enable data roaming to send/receive texts, in fact you want to ensure data roaming is off or you will incur major data charges because your phones will use data if data roaming is enabled. The only thing you need to do to be able to send/receive texts is be connected to cell service. Unfortunately, that means your phone is also available to receive calls. The only way to not receive calls is to be in airplane mode, which also means no texting. Of course when on wifi, you will still be able to send/receive iMessages.
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