It's never happened to any of the seven Android device I've used.
That said, some manufacturers and service providers tweak Android to suit their purposes so check in Settings in case your version is set to delete them.
It's never happened to any of the seven Android device I've used.
That said, some manufacturers and service providers tweak Android to suit their purposes so check in Settings in case your version is set to delete them.
Oh dear - when they're gone, they really are gone.
Depending on the type of contact you have, you may find a list of all the call you made if you check your account webpages. You might be able partially to make a new contacts list if the numbers trigger something in your memory.