Xcode 7 develop for iOS without developer account
You don't need to pay for an Apple's developer want the $99 option for a store certificate, billing and general code signing certificates.

Your personal AppleID is good enough to sign apps in Xcode and load them on a limited number of devices (5 or so) from your Mac to get started with developing. Once you need TestFlight or want to make a signed app that is reviewed - you need to pay, but get started for free. 

Here’s how I would undo a previous paid AppleID - you might need Apple Developer support to help you release your AppleID from the paid program if you are reusing the same AppleID (and I encourage always reusing the same and not making new accounts when you run into a hiccup like this).

Instead, delete all Xcode copies you might have installed earlier - whether they are from the Mac App Store or downloaded and then install Xcode 7 from the Mac App store:


https://itunes.apple.com/us/app/xcode/id497799835?mt=12


Once it downloads, run the app and go to the settings:


click Accounts
click the + in the lower left and add an Apple ID
enter a personal Apple ID, the one you use for the App Store is fine to reuse
you're done


When you build an app for iOS, connect the iOS device and choose that AppleID to sign the app when asked.