O2 UK uses a compression on all images, which should make pages load quicker but the compression system is a little slow and sometimes slow things down because of the lowered 3G speeds (This only applies to downloads only. This should not affect upload speed). This can sometimes make a big difference. O2 does have a bypass APN, which all pay monthly subscribers can use instead at no extra cost. They obviously keep this quiet. Using my method, tethering also still works. (Please note the APN file was not created by me. It was made by Unlockit.co.nz) But first here is my evidence: iPhone 4S Speed test before bypassing compression: iPhone 4S Speed test after bypassing compression: You can clearly see that my download speeds are far better in exactly the same location without the data compression. Here is tethering also working without the data compression (Changing the APN manually removed the tethering option) To download the profile go to https://rapidshare.com/files/885584186/settings__3_.mobileconfig You should then get a install profile page popup (Mentioning something to do with mobile.o2.co.uk). Click install and type in your pass code if you have one. You should then see some sort of confirmation message. This is all you need to do. Should you want to remove this. Go into Settings, General and the profile. Select O2 (Bypass) and click remove. I hope this helps any O2 users get faster 3G speeds on the network. Feel free to ask any questions.