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wasn't that hard to find

10. * Data Plans and Other Features. You will be charged for data usage on a pay per use basis unless you are required to maintain a data plan (“Data Plan”) as part of your Service, or as otherwise provided by your Rate Plan or prepaid data pass. Permissible and Prohibited Uses: Your Data Plan is intended for Web browsing, messaging, and similar activities on your Device and not on any other equipment. Unless explicitly permitted by your Data Plan, other uses, including for example, using your Device as a modem or tethering your Device to a personal computer or other hardware, are not permitted. Other examples of prohibited uses can be found in Section 17. Protective Measures: To provide a good experience for the majority of our customers and minimize capacity issues and degradation in network performance, we may take measures including temporarily reducing data throughput for a subset of customers who use a disproportionate amount of bandwidth. If your total usage exceeds 5GB (amount is subject to change without notice; please check T-Mobile’s T&Cs on www.T-Mobile.com for updates) during a billing cycle, we may reduce your data speed for the remainder of that billing cycle. If you use your Data Plan in a manner that could interfere with other customers’ service, affect our ability to allocate network capacity among customers, or degrade service quality for other customers, we may suspend, terminate, or restrict your data session, or switch you to a more appropriate Data Plan. Downloadable Content and Applications: Content or Applications (e.g., downloadable or networked applications, wallpapers, ringtones, games, and productivity tools) (“Content & Apps”) that you can purchase with your Device may not be sold by T-Mobile. For some third party purchases, although the charges may appear on your T-Mobile bill, T-Mobile is not responsible for the Content & Apps, including download, installation, use, transmission failure, interruption, or delay, or any content or website you may be able to access through the Content & Apps. Any support questions for these Content & Apps may be directed to the third party seller. You may be able to restrict access and certain services by implementing controls available at www.T-Mobile.com or by calling T-Mobile. When you use, download or install Content & Apps sold by a third party seller, you may be subject to license terms between you and third parties. When you use, download, or install Content & Apps that you purchase from T-Mobile, the Content & Apps are licensed to you by T-Mobile and may be subject to additional license terms between you and third parties. Whether purchased from T-Mobile or a third party, any Content & Apps you purchase are licensed for personal, lawful, non-commercial use on your Device only. You may not transfer, copy, or reverse engineer any Content & Apps, or alter, disable or circumvent any digital rights management security features embedded in the Content & Apps. Content & Apps may not be transferable from one Device to another Device. Some Devices or Content & Apps may continue to have contact with our network without your knowledge which may result in additional Charges, for example, while roaming internationally. Software on your Device may automatically shut down or limit the use of Content & Apps or other features or Services without warning. T-Mobile is not responsible for any third party content, advertisements, or websites you may be able to access using your Device. Use of Information: T-Mobile may retain, use, and share information collected when you download, use, or install some Content & Apps, may update your Content & Apps remotely, or may disable or remove any Content & Apps at any time. Refer to T-Mobile’s Privacy Policy, as well as the Content & Apps creator/owner’s privacy policy for information regarding their use of information collected when you download, install, or use any third party Content & Apps. We are not responsible for any transmission failure, interruption, or delay related to Content & Apps, or any content or website you may be able to access through the Content & Apps. Wi-Fi Calling: You acknowledge and agree that your use of any Wi-Fi network is permissible and that you (and not T-Mobile) are responsible for your use. Cell Broadcasts (alerts that go to certain customers) and Wireless Priority Service (WPS) may not be available with Wi-Fi Calling.

The bolded section covers the part about being switched to an approperiate plan