When in Wellington - the closest 4G to where I live - I find that my iPhone responsiveness falls dramatically.
For example, typing into the search bar in Safari becomes laborious, with repeated pressing being required before a letter is entered. Sometimes opening/closing things takes ages and so on.
I get round it by just switching 4G off.
However, I understood 4G was supposed to be 'better' than 3G and in this case it really isn't.
Have I got a wrong setting somewhere or something, or is this just how it is?