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O2 are a major mobile telecommunications network in the UK and elsewhere in the world. Like many large mobile networks they have also released handsets bearing their branding in the past. The vast majority of the O2 branded handsets were part of the O2 XDA range - a collection of smartphone/PDAs manufactured by a selection of manufacturers including HTC and Quanta but badged with the O2 brand.

There are no particularly recent additions to the O2 family of mobile phones, this cessation in new releases coincides with the widespread launch of HTC items under their own name in the UK. The majority of the O2 phones released boasted impressive specifications and PDA functionality - the more recent XDA models, although not recent pack impressive functionality even by modern day standards.