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I have a Vodafone smartphone and when incoming calls are coming in the screen stays black. The phone vibrates and rings but I cannot see who is calling
Which model of Vodafone phone is it that your using please ?
Caller ID should display your incoming calls if a company or person does not block their number from showing.
Try looking in somewhere similar to the following.
That or look for the Caller ID settings in your phone.
Current Phone > Samsung Note 9 _512Gb > Model: SM-N960 Hybrid-Duos.
Samsung Gear s3 Frontier Watch.
Can you try clearing recent apps and restarting the phone? This may be as simple as a resource issue and doing thta will free things up and may clear the problem.