While Windows Phone 7 users were required to attach their phones to a PC to install updates , starting with Windows Phone 8 , all updates are done via over - the - air downloads .
Head entity: windows phone 7 Q1854343 1 2 3
Tail entity: windows phone 8 Q34825 20 21 22
Relation (head \u2192 tail): P156
Inverse relation (tail \u2192 head): P155