How do I remove jamphone from my Android 4.0.3?

I have bought myself a second hand android 4.0.3 and there are specific things that I can't get rid of, such as jamphone, app,ect... I would like to know how I could get rid of all theese because factory reseting doesn't get rid of any thing (by this I mean that some how when I factory reset my phone, before it even turns back on, they are all back). I have tried over 65 different ways to delete them, but none have acomplished their tasks... Please help me find a way to get rid of theese things. Also I can't download any apps from the Play Store, every time it says: COULD NOT CONNECT TO SERVER. PLEASE TRY AGAIN. :-X :(

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