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
Bojan Krkic could make his first Premier League appearance of the season in Stoke's clash with West Brom on Saturday.
Tonight: a transgender 8-year-old, how a horse is helping a boy with Asperger's and a nurse who would prefer not to be noticed.
As we go into the Bank Holiday weekend, the changeable weather pattern looks set to continue.