My iPhone 4 is freaking out?

So I've had this phone since July of 2012 and my upgrade is this year. I have to wait for my upgrade to get a new phone but my 4 is spazzing. It makes the keyboard disappear at random times, the keyboard has missing letters at times, I can't see my messages unless someone texts me, all my apps crash all the time, and the phone freezes constantly. I don't know what to do and this is getting annoying.

Buy another "cheap" phone until your upgrade is due, you can get a used HTC Wildfire S from eBay for under $50.

That little iphone4 is pretty tough and its not very likely that it's hurt, it's most likely just cluttered up with junk.

Do you ever clean up your phone by clicking on to the desktop, now double click again, now hold down on one of the icons for a few seconds, now delete every one of them.
Now click on the home screen
Go to settings
Click safari
Clear cookies
Clear history
Clear cache

Also while you are there go to database
And get rid of any that isn't Related to active email addresses

Also if "databases" are not visible in your safari setting, then do a complete turn off of your phone and when you return database will return also

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