Just to let everyone know, from personal experience (I have this phone) and from peering into the phone's prepaid parameters, the LG 3280 is definately a SingleRate phone, except with a CDMA twist. It's SingleRate in that, even if you're roaming, you're still charged at one unit per minute of airtime used. And yes, I've tested this. And text is 0.3 units, like with the newer GSM SingleRate phones (Motorola c139, v176, c261).
The CDMA twist is that, if your outgoing call isn't longer than 15 seconds, you won't be deducted airtime for it. Incoming calls, though, cost from second one. But anyway, just clearing things up. If I've helped anyone, click an ad or two for me. :)