we recently switched to Verizon. I am unable to receive texts from certain numbers on my old phone with the new number, but not all (including from verizon and google) . It doesn't appear to matter if the sender is using an Apple or Samsung or anything.
My husband received a new phone that we ported his number to and is receiving texts on his old phone still. We are unable to fix the problem by clearing the data, reinstalling the sim cards, making sure no numbers are blocked.