A stuck iPhone 5c power button can be a recipe for disaster. Without the ability to turn your phone off, you can wind up having to leave it on during times of the day when you don't need it – and have it run out of battery when you do. In order to deal with these problems, troubleshooting is vital. You don't want to send the phone to Apple for their costly repairs or replaceit if you don't need to. Utilizing a different repair service can save you money in the long run, but not as much as finding and fixing whatever problem exists yourself.
Diagnostics
If your phone is giving you a lot of problems, turning on the AssistiveTouch feature under Settings | General | Accessibility will allow you to quickly create a secondary power button in case you need to turn your phone off. This is a good stop-gap measure, but it isn't enough to actually fix the problem. In order to do that, you'll have to delve deeper in to some hardware solutions for your phone.
Repair
The sad thing about your iPhone 5c power button repair is that there are very few ways to actually fix this problem without taking the case itself apart and reaching around in there. The people over at iMore have a solid guide for dealing with the two points of failure that can keep your power button from properly functioning. The culprit is either the cable or the button. It is difficult to know until a repair has been made as to which part is causing an individual problem, and replacing them both is not much less cost-effective than replacing either one of them individually. The steps involved are complex, and require the use of several specialized iPhone 5c repair tools, so be sure you know what you're getting into before you make the switch.
Other options
If you are unsure as to your technical ability, there are other ways for you to get your iPhone 5c fixed. While the simplest solution is to bring your phone to Apple, other repair shops can do what they would at a fraction of the cost. For the best possible service at the lowest price, you should contact iResQ. We're ready to help you deal with a variety of problems related to your iPhone.