I have loved Samsung since their flip phone in 1999, but this S21+ has given me nothing but problems since I got it. If I get a text from another service like Messenger from FB, I don't get messages here till I realize, and go into Settings and fix it. It is a huge pain and it's only since having this new phone. The last thing I want to do is get an iPhone but it's coming. As far as calendar goes I get about half the notifications I ask to get so I don't know.