"The plans offered by Trifa are prepaid, so you won't incur charges beyond the amount you've purchased.
However, if you have the domestic SIM card 'On' and use data and make calls, carrier charges may apply domestically.
For those who are concerned, we recommend turning off any domestic SIM cards, except for Trifa's, while traveling.
How to identify which SIM card is Trifa's:
Domestic SIM cards typically display your regular phone number, whereas Trifa's SIM card will not display a phone number."
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