Not sure how long they have being doing it but MusicMagpie are offering phone rental deals that last 12 months. Loads to choose from in the refurb models.
Unlocked start at £6.99 per month for an iPhone 6s, can go quite expensive for newer models.
What I like is it also gives full warranty, accidental damage cover and they throw in a case and protector (claim they are £19.99 each but take that with a pinch of salt).
Not for everyone but match this with one of the SIM only deals on here and you have a great cheap phone especially as a started for kids who will undoubtedly drop it within 12 months.
At the end of the contract you can either upgrade for free, return the phone, or continue at a cheaper price.musicmagpie.co.uk/sto…asc