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
A mixed week ahead weather wise with milder conditions for many towards the weekend
A damp start to the working week with brighter weather for most later in the day
Having a longer pregnancy also reduced the risk of suffering from post-natal depression, a study found.