Hi, this was REALLY frustrating me too. I have just been fiddling and fiddling with this phone ,determined to find something that works , and I think I found it. Go to a screen that has textyouwould like to make bigger. Do the'zoom' motion with your fingers (the opposite of the 'pinch' motion . ) Make the letters as big or as small as you'd like,using this motion. NOW, double tap . The letters should stay the size you chose . This absolutely worked for me and WORKS for me, every time Ido this. Now, Idon't remember all the things I tapped or untapped before discovering this. I followed suggestions given by other people on this forum. Try everything they suggest and try this too. It should work .