Prepare an iOpener and apply it to the left edge of the display for about two minutes.

You may need to reheat and reapply the iOpener several times to get the phone warm enough. Follow the iOpener instructions to avoid overheating.

The glue securing the display can be significantly stronger than the glue that secures the back cover. If necessary, switch to a hair dryer or heat gun in order to apply enough heat to weaken the adhesive.