I dislike the tendency of this forum to sneer at the poors but on this:

If you are so poor that you can't afford to buy your phone outright then getting one from a mobile network on what is effectively a very expensive hire purchase scheme is rank idiocy. You need to buy a second hand iPhone SE 2 (still gets software updates, perfectly acceptable performance, under £50), or whatever Android garbage takes your fancy if inclined that way, until you are no longer throwing £100s down the toilet to buy an expensive luxury in a stupid way.