Sorry to hear about the difficulty with setup! At what screen exactly are you experiencing the stall? I'd like to try a few troubleshooting steps:
1) Can you please try power cycling your phone? Check and see if this improves the process.
2) Using your mobile browser, could you try navigating to https://app.rach.io/ If you're currently logged in, try logging out and then try the process again
Let me know if you experience any improvement or not and we can continue troubleshooting!