Tracfone Refer-A-Friend: I've Found The Problem

I've finally figured out why I haven't been able to successfully do refer-a-friend with Tracfone lately...sort of. It seems their refer-a-friend program works well only when the referring phone is GSM. Sounds odd, but that has been my experience. I've referred CDMA phones by CDMA phones and the process has worked, after a ton of retries and such, but when I tried to refer a GSM phone with a CDMA phone I could never get things to work, at least lately. I'm emailing Tracfone right now to see if the problem can be set to rights...