To make a call while you are roaming overseas, whether you’re calling within the country or to a location outside it, simply dial "+" and the country code, the city code (if necessary), and the local number. For example, if you want to reach T-Mobile Customer Care when you’re roaming internationally, dial the plus sign (+) followed by 1-505-998-3793 from your mobile phone. From a landline phone, dial the International Direct Dialing prefix for the country you are in, followed by 1-505-998-3793. T-Mobile will not charge you for the call to Customer Care, but long distance fees may apply if you call from a landline phone.
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