@TimmehSounds like congestion in your local area, which can happen at peak times..
If you drop down to 3G is the network any faster.
It may also be worth checking if there are any service issues in your local area by going to
https://status.o2.co.uk
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iPhone 16 Pro Max - o2 and Spusu
Xperia 1V - Spusu
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This is not customer services and we dont have access to your account
I do not work for o2 or any VMo2 /Telefonica/Liberty Global Company