You can read lots of tips about the iPhone and iPad on the internet – some are correct others are not – lets look at some that are not
Deleting photos and other data off your iPhone or iPad will speed it up.
No, you will probably just lose data
If you delete apps off your iPhone or iPad will it speed up.
No, unless the app is doing a lot in the background
Closing apps down speeds up your iPhone or iPad.
No. It can actually slow it down and even use more battery when it needs to reload that app.
Read more the full list of myths at ZDNET