I am currently on an O2 contract and looking to upgrade. I’ve looked at my options and like the iPhone XS Max or the iPhone 11 Pro max. The question I have though is if (with no discounts) I put in the same tariff plans into each phone (unlimited texts and minutes and 15GB of data) one comes out as £28 a month and the other £24 for the tariff costs. I understand the phone/ device prices will be different but why if it is same tariffs chosen are the tariff prices different? Surely tariff price isn’t phone dependant? Thanks