The only problem with using a smart phone like that above is unless your flying at night (which is actually good fun) you can't see the phone screen . it absolutely useless unless you have a box around it.
If you want to upgrade to the hero 3+ use the 20 quid of 200 spend on 0² priority moments at PC world.
Oh and they do have a history of flying off and never coming back. So buy a 20 quid gsm GPS so you can find it again should that happen.
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