I've unlocked my T-Mobile phone, but I'm considering switching to a different carrier. What limitations, if any, should I know about before making the switch?

Before switching carriers after unlocking your T-Mobile phone, consider these limitations:
• Some carriers don't support unlocked phones. Check that the carrier you're switching to supports your phone's make and model. You can find this information on the carrier's website or contact customer service.
• Switching carriers may require a new SIM card. The carrier you switch to will help you activate a new SIM card.
• New carrier activation fees may apply. Starting service with a new carrier usually costs $20–$50.
• T-Mobile Wi-Fi Calling and Visual Voicemail may not work on other carriers. To ensure your phone will retain these features, ask the new carrier if they offer similar features.
• Roaming charges may apply when using a partner network in areas where your new carrier does not cover. Ask your prospective carrier about roaming plans to reduce roaming costs.
Knowing these eases the transition and helps you choose a mobile provider.