It might not be a device/iOS issue? Have had the same number for about 20 years through Cingular/AT&T and was getting calls on a regular basis, particularly bad leading up to and during covid era (3-4 per day). Ported same number to tmobile earlier this year and spam calls have dropped to maybe one every other week - at most. My take then is that depending on your carrier screening or not pairing with carriers initiating the spam calls.
It might not be a device/iOS issue? Have had the same number for about 20 years through Cingular/AT&T and was getting calls on a regular basis, particularly bad leading up to and during covid era (3-4 per day). Ported same number to tmobile earlier this year and spam calls have dropped to maybe one every other week - at most. My take then is that depending on your carrier screening or not pairing with carriers initiating the spam calls.