I can’t make or receive calls or FaceTime on my iPhone 7 Plus

Bonjovi1 wrote: "Yes it still has original battery and battery health is at 69%"

69% indicates an unhealthy, weak battery and probably explains the problem. (80% is considered borderline unhealthy.) Have the battery replaced:

iPhone Battery & Power Repair

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Bonjovi ~ Does your iPhone 7 Plus still have its original battery?

Also, what's the Maximum Capacity % here?...

Settings > Battery > Battery Health

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