I can’t call out or receive calls

Start here: If you can't make or receive calls on your iPhone - Apple Support and contact your carrier for help with this.

Angel ~ Does your iPhone 8 Plus still have its original battery?

And what's the Maximum Capacity % here?...

Settings > Battery > Battery Health

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Hi

I joined Giffgaff few years ago but three months ago my iphone8 plus can't call in or out. So I removed to O2 a month ago . Problems is still there. Ask many many agents or O2 shop could solve the problem. Can you help?

Angel