I am traveling in India and want to receive and make a few limited calls using my T-Mobile number. My iPhone 5S works fine with the local roaming network Airtel, and I know the T-Mobile roaming rates here will be about $3.5 per minute. My current prepaid balance is zero and I have no international roaming activated. My question is- If I buy a $50 refill online, how do I apply it to my t-mobile number and use it to make my roaming calls here in India?
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