i need to format my phone

[Android Central Question]

Hey! Its been a long time since my phone has started showing low storage. I think formatting the phone may help. So i need to know how to format it and also how to save the contacts without being erased

 

[Rukbat]

Formatting the phone will turn it into a paper weight.

Back up the contents (see Backing up an Android Device), then do a factory reset. Then restore everything you backed up.

(Although it's probably some app you downloaded, that's running in the background, that's causing the slowdown, so restoring that app will still slow a reset phone down.)

Since we don't know the phone, or the version of Android it's running, we can't offer anything more.