mobile

Ok so I am new to all of this but I am not happy with Sprint and was overcharged and now I owe Sprint way too much but I need service but cannot afford a new phone. My question is that is there a way to carrier unlock the HTC one without a computer so I can take it to another carrier a.k.a. cricket or straighttalk? I am running Android lollipop 5.0 currently and I have looked arround everywhere and cannot find anything to help me. Please help point me in the right direction.