Buying a refurbished HTC One

My HTC One isn't charging well, and I need to replace. Any thoughts or experiences with buying a factory refurbished phone on Ebay? Does it need to be "factory unlocked"? How hard is it to change the SIM card?

Thanks!

Which model HTC One? I used to have an HTC One M7 that wouldn't charge. I did the following and it was fixed:

Reset the charging logic
To reset the charging logic, charge the device for at least 10 minutes. Turn off the device, but do not unplug it. Once the device is off, push and hold down the volume up, volume down and power buttons for two minutes. After two minutes let got of the buttons. The charging logic is now reset. Allow the phone to charge to 100% before unplugging.

https://www.ifixit.com/Wiki/HTC_One_M7_Troubleshooting

Thanks - I'll try that. I have an M7. Still, I may need to buy a refurbished phone, so I'm still interested in any ideas others have about it.

gj1 said:
Which model HTC One? I used to have an HTC One M7 that wouldn't charge. I did the following and it was fixed:
Reset the charging logic
To reset the charging logic, charge the device for at least 10 minutes. Turn off the device, but do not unplug it. Once the device is off, push and hold down the volume up, volume down and power buttons for two minutes. After two minutes let got of the buttons. The charging logic is now reset. Allow the phone to charge to 100% before unplugging.
https://www.ifixit.com/Wiki/HTC_One_M7_Troubleshooting

I have an HTC One that is unlocked and that I no longer need. PM me if you are interested. It was on T-mobile, so its that bandwidth for providers.

I'm not familiar w/ phones... could the battery be dead? need to be replaced?

Thanks JG1, but it didn't work. And thanks for the offer Rowerg, but I'm on VZW. Off to buy a new phone now...