Roaming in India?

Hello my wife is traveling to India for a short trip. She wants access to bank OTP messages on her mint mobile number when she’s there. She doesent need data since she has a local number and can use data from that number. Since mint uses t mo network I assume she will receive the otps. But can a mint representative or support confirm us bank’s otp messages will be received on her phone when she’s in India? If it makes a difference she has the 12 month unlimited data plan and she is active right now. Not sure what the expiration date is. But it probably will auto renew