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iPhone fans in the UK have struggled to get their hands on the latest version of the popular smartphone.

A glitch with the online registration system run by the O2 network meant that many people could not activate their devices at Apple stores.

The same glitch hit O2 stores but was quickly resolved, according to the firm, which is the only network to offer the iPhone in the UK.

In addition, many stores sold out within hours of opening.

The new version, which is cheaper and faster, went on sale in 22 countries.

More than 1,500 people lined up outside one Tokyo store, whilst guards in kevlar vests and helmets stood watch over 500 devices in Hong Kong.