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On July 7th I did a clean re-install of iOS 18.5 and then updated to the dev beta 3 of iOS 26 and since then the consumption of cell data has been really low. I started iOS 26 with none of my apps installed except My Data Manager and had nothing running for a few days then gradually reinstalled my apps and switched on location services, etc. It's used 192mb of cell data for system services since the update (avg 15mb/day) which is a massive drop compared to how it was on iOS 18.

For the past few days it's been back running as a 'normal' iphone & I'll definitely be updating to the public beta of 26 if/when it comes out this week as it seems way better running the new iOS (even in beta form) than 18.
 
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