Qualifying post-paid multi-line plan required. Calls and messages sent or received while roaming on another carrier’s network, and not on the T-Mobile USA network (“roaming”), may not count towards allowance limits. Even if a number is on your Never Allowed List or otherwise blocked, you may still be able to send and receive calls and messages to and from that number while roaming. Your Never Allowed list may not include international numbers. Always Allowed numbers must be domestic ten-digit phone numbers; toll-free T-Mobile numbers are excluded. Family Allowances is for domestic use only and will not work while roaming internationally.