Hi there and welcome Karen
If your pairing it to a new phone you need to reset the band
To do this
Press and hold the power button and the action button on your Band at the same time.
Step 2:After three seconds, your Band will show Turn Power off? You can power down your Band and restart it by swiping left and tapping Yes, or you can continue to hold down both buttons for an additional seven to eight seconds.
Step 3:After an additional seven to eight seconds, your Band’s screen will flash red. You can release both buttons and your Band will perform a quick restart, or you can continue to hold down both buttons for a few more seconds.
Step 4:Release both buttons. You Band will now be turned off.
Step 5:Press the power button to restart your Band.
Then try to pair it
Let me know the results please.