if your uml290 is working on 3g & 4g with vzam can you tell me what model macbook you're using? i have an old (second gen maybe) mbp and vzam in a 3g area connects every time and pretty darn quickly. vpn works. no issues.
with my newer unibody mb and mbp i'm finding connecting almost never works. it sometimes connects, but refuses to get an address in 3g or 4g areas. i plan to test my old mbp in a 4g area later today to see if it works well like in 3g areas.
trying to narrow down if it's a hardware issue or config issue. my newer macs have fusion and other things installed that my old mbp (the wife's now) don't have.
thanks!