Hello @dtverster 
If you still have access to your SIM card (or a new one with the same phone number), you just need to log back in normally after downloading the :r: app 
Else, you have 3 options to contact support and get this fixed, as they can change your phone number:
1. Contact support and wait
Try to log in with your old phone number and, when you’re asked for the pin, do not type it, but click Forgot? and then Support. You’ll be able to reach the support chat there 
2. Head to Twitter
You might also want to reach :r: on Twitter, to see if they can speed things up:
https://twitter.com/Revolutapp
3. Invoke the omnipotent @anon33247966
And he will (surely) do his administrative magic 
Also, side note: This has been discussed plenty of times. Like 30% of the posts in the forum revolve about this. There might be something to do (sticky post, a change to the app, IDK, @anon33247966, please)