Hi, the Samsung Galaxy S4 is my first android phone. I've been playing around, downloading some apps and messing with all the settings for a day or two now and trying out a couple of things. I don't know why, but now I've got to grips with everything I'd like to start afresh and carry out a factory reset, returning everything to default setting and undoing anything I might have done. I was wondering if carrying out a factory reset will have any implications on the reebooted system (will there be stuff that won't be removed, slowing down the system after a factory reset). I don't care about losing any contact information or anything as I haven't transferred it from my old phone yet anyway, I'm just concerned that doing a reset won't do the device any good.. do you advise I that I should avoid a factory reset, or are my concerns unwarranted? Many thanks.