is unblocking no still possible?

anything they sent while the number was blocked won't turn up after you unblock. it doesn't queue, it's just gone, so don't wait for a flood of old messages.

phone app, three dots top right, settings, blocked numbers. the number will be sat in that list with an x beside it. one thing that catches people: the messages app keeps its own separate spam and block list. so if calls come through fine afterwards but texts still don't, go and check there as well. samsung phones label it block numbers rather than blocked numbers, same thing.