on 16-09-2017 19:16
You could try the iPhone upgrade program if you don’t want to buy the phone outright. Info here: https://www.apple.com/uk/shop/iphone/iphone-upgrade-program
on 17-09-2017 13:15
O2 have been behind for years when it comes to Apple.
Have you forgotten about built-in Wifi calling? It took roughly 2 years for O2 to finally come on board when EE had it around launch.
iCloud Wifi calling is still not available (I tried it in T-Mobile US this year and it was great) but I expect EE to be ahead of O2 with this feature as well.
It's official. EE is #1 for iPhone features. O2 has fallen behind. In fact, if they didn't have Visual Voicemail...they will be no different compared to Three and Vodafone.
I'll be moving to EE in a couple months time. This broke the camel's back.