jailbreaking iOS devices and installing a tethering application on the device. Tethering is also available as a downloadable third-party application on most Symbian mobile phones as well as on the MeeGo platform and on WebOS mobiles phones. In carriers' contracts Depending on the wireless carrier, a user's cellular device may have restricted functionality. While tethering may be allowed at no extra cost, some carriers impose a one-time charge to enable tethering and others forbid tethering or impose added data charges. Contracts that advertise "unlimited" data usage often have limits detailed in a Fair usage policy. United Kingdom Since 2014, all pay-monthly plans from the Three network in the UK include a "personal hotspot" feature. Earlier, two tethering-permitted mobile plans offered unlimited data: The Full Monty on T-Mobile, and The One Plan on Three. Three offered tethering as a standard feature until early 2012, retaining it on selected plans. T-Mobile dropped tethering on its unlimited data plans in late 2012. United States As cited in Sprint Nextel's "Terms of Service": "Except with Phone-as-Modem plans, you may not use a mobile device (including a Bluetooth device) as a modem in connection with any computer. We reserve the right to deny or terminate service without notice for any misuse or any use that adversely affects network performance." T-Mobile USA has a similar clause in its "Terms & Conditions": "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." T-Mobile's Simple Family or Simple Business plans offer "Hotspot" from devices that offer that function (such as Apple iPhone) to up to 5 devices. Since 2014-03-27, 1000 MB/month is free in the US with cellular service. The host device has unlimited slow internet for the rest of the month, and all month while roaming in 100 countries, but with no tethering. For $10 or $20/month more per host device, the amount of data available for tethering can be increased markedly. The host device cellular services can be canceled, added, or changed at any time, pro-rated, data tethering levels can be changed month-to-month, and T-Mobile no longer requires any long-term service contracts, allowing users to bring their own devices or buy devices from them, independent of whether they continue service with them. Verizon Wireless and AT&T Mobility offer wired tethering to their plans for