I tried to pair my Square Reader with this new phone (it paired fine with my Samsung S20FE) but it won't with my new phone. I found out the Bluetooth pairing program with certain devices is a known issue with the Ultra and I've tried everything I've seen on these boards but nothing has worked. It sees the square device but won't pair. Square suggested clearing Bluetooth cache but that option is grayed out. I've seen that issue on the boards as well for this particular device. Someone said to launch the phone in safe mode but it doesn't work on the ultra 23 lol. Help!!