Chosen Solution

Being a dinosaur, I have no micro-wave to heat the Iopener. Can I use boiling water to heat it for softening the glue on my phone’s screen?

You should not heat the iOpener using anything other than a microwave. Do you have access to a hairdryer instead? Honestly I never use the iOpener, I would suggest either using a hairdryer/heat gun, which always works faster for me, or going somewhere with access to a microwave.