Depending on where you are, there are usually cheap options for prepaid SIMs.Mainly not keen on having different two phone numbers and paying for another sim / data plan etc, carrying multiple phones, I suppose it’s mostly cost reasons plus everything I need fits onto a 64gb device easily
Of course, I can afford to have 4 SIMs because data plans are highly affordable here. My main postpaid number is about $6.50 a month for 10GB, while for prepaid I can get as cheap as 65cents a month for 1GB (great for backup SIM). 😆