Postpaid only. Credit approval, deposit and $25 SIM starter kit or, in stores & on customer service calls, $20 upgrade support charge may be required. AutoPay Pricing: For lines 1-8. Without AutoPay: $5 more per line. AutoPay price may not be reflected on 1st bill; see 2nd bill for adjustment.U.S. roaming and on-network data allotments differ: includes 200 MB roaming. Partial megabytes rounded up. T-Mobile ONE Mobile Internet Service (Tablet): T-Mobile ONE not available for hotspots and some other data-first devices. Not for extended international use; you must reside in the U.S. and primary usage must occur on our U.S. network. Service may be terminated or restricted for excessive roaming. Communications with premium-rate numbers not included. Video streaming at up to 1.5Mbps; may affect speed of video downloads. For best performance, leave video streaming applications at default automatic resolution setting. Tethering: Tethering at max 3G speeds. For the small fraction of customers using >50GB/mo., majority of data usage must be on tablet. Tablet usage is prioritized over tethering usage, which may result in higher speeds for data used on tablet. See T-Mobile.com/OpenInternet for data management details. T-Mobile ONE Wearable Service: Select companion smartphone and separate qualifying service on each device required.