While you're not supposed to use mobile data while connected to a Wi-Fi network, there are a few exceptions that could cause ...

Go to Settings > Network and Internet > Data Saver. Toggle on "Use Data Saver," then tap "Unrestricted Mobile Data" to select ...

T-Mobile also offers international perks with its top plans, offering in-flight Wi-Fi to keep you connected on your travels. The carrier offers up to 15GB of high-speed data in Mexico and Canada ...