Iphone 4s Problems What Should I Do?

I Have had my iphone for a while now and i haven't ever noticed until yesterday but when i charge the phone and try o use it at the same time the screen seems to get a mind of its own what should i do? I'm not using the charger that comes with the phone could that be the reason i also cleaned the screen and blew air into the charging port in order to take out any dust. Any help at all would be appreciated, thanks.

Change the battery

When using your iphone while charging it usually do this type of things. It doesn't mean that your unit is already damaged or malfunctioning. It will fully function normally after you disconnect it when you finished charging so just don't use your iphone while being charged.