If you find difficult to read the text in iPhone browser here is the solution
Just follow these steps
1. Go to any web site you want.
2. After loading click on the address bar of the browser
3. Delete whatever you have in the address bar.
4. Paste the below code in the address bar
5. Tap on Go button at the bottom
Notes: you can change the value 18 to whatever font you want.
Make sure that you do not have any New Line character int code.