Brother and sister Olly and Charlotte McIlroy, from Bexleyheath, spent more than £2,000 on four handsets for their family.
The pair were drawn to the 5S Touch ID technology which allows users to unlock their phone with the touch of a finger.
The queue snaked around a packed Regent's Park, with several people carrying tents and energy drinks as they made their way towards the store from 8am.
More top news
Ukip's only MP Douglas Carswell is quitting the party and will sit in the House of Commons as the independent MP for Clacton.
Leaders from across Europe gathered in Rome to mark the 60th anniversary of the signing of a treaty which led to the formation of the EU.
The actress said film-makers doubted if she could play a straight woman in a romantic lead after speaking publicly about her sexuality.