Ok I got my iPhone working with my home WLAN but having problems over 3G. I changed the server IP address on the iPhone BiaB application from that listed in the PC Desktop BiaB IP server to the world IP address of my router. It looked liked everything was working ok until I tried to regenerate a song over 3G. The progress bar almost made it to the end but this error message popped up:

Band-In-A-Box
The operation couldn't be
completed. (OSStatus error
2003334207.)

I am also confused about the IP address situation and the PG Music online help was not clear about this. Working in my home on the WLAN there is only one IP address required. I just match the iPhone BiaB application to the IP address listed in the PC BiaB server. When going outside and trying to use my mobile phone company 3G network it seems there would be 2 IP addresses involved. One to connect thru the Internet to my router IP address and another for my iPhone BiaB app to talk to the PC BiaB server. The iPhone BiaB app only has one field for the IP address. Once I remove the IP address for using in my home and change to the world IP address of my router how can the application work? By the way, I did setup the port forwarding as instructed in the PG Music online video.

AMD FX-8350 4.6 GHz, 16G RAM, solid-state drives, Windows 10, Scarlett Audio Interface, 2021 BIAB & RB, FL Studio Producer, Studio One Producer, Melodyne Editor, Ozone Advanced.