If you need to forward or reforward your iPhone calls to YouMail at any time, just follow these simple steps.
1. Open up your YouMail app
2. Open the Menu and select “More”
3. Tap “Activate YouMail” and follow the on-screen instructions
4. You should be connected after following the steps in the app. Make a test call to ensure that your phone is forwarded properly.
Please follow this link for an interactive troubleshooting page:
https://support.youmail.com/hc/en-us
The full article can be found in the following link:
https://support.youmail.com/hc/en-us/articles/200478408-How-to-Manually-Connect-Your-iPhone-to-YouMail