iPhone 4 very slow and lags a lot?

[Visualvolcano914]

I have had my iPhone for about a year and over the past week the internet, games, and texting all have become slower. The games lag so much that you cant even play them. I heard that if you delete some unnecessary things your phone will return to original state. i now only have two apps that do not come with the phone, subway surfers and Instagram. i also have very little music and deleted a lot of photos.
Is my phone dying and going to stop working? Is there a fix to this? will it remain like this until I get a new phone? please help!! thanks

[David]

Just update it and that will wipe EVERYTHING from it, it will just be a blank iphone with a running system. It should work then. But if you want to spare yourself the trouble, I'd upgrade.

[jordan g]

if you double click the home button it will show you all the apps that are still open even if you deleted them they could still be open on your phone so you just double click the home button and hold your finger on the app until it starts shaking then you just hit the little red icon and it will close it this might help speed it up hope this helps

[I Answer.]

Did you know your text message also hold a lot of memory?! Delete those, here are your options

NON JAILBROKEN PHONE
1. Restore
2. Restore & Backup
3. DFU mode

JAILBROKEN PHONE
1. Restore
2. Restore & Backup & no re-jailbreak
3. Restore & Backup & re-jailbreak

If you do not know how to re-jailbreak just ask me on my tumblr page or through here
Good Luck