Updated app lets you spend up to £250 in one go.
Huge demand and lack of supply could mean a lengthy wait.
Peer-to-peer payments system was first shown off back in June.
Reasons for sluggish adoption rate are unclear.
Apple advises those affected to use passcode instead.
Not three as originally suggested.
EVS technology offers better call quality and reliability.
Tim Cook bigs up new phone, but all eyes are on iPhone X.
Insiders reveal all about forthcoming smartphones.
Better battery. Better screen. And wireless charging for the first time.
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