Got a Globe Tattoo prepaid USB to use on the go with my macbook and discovered just how NOT Mac friendly this is, among other NOT customer friendly aspects. My first pet peeve - you can't re-load using a prepaid card unless you take the SIM out and put it in a phone. That's being customer friendly! NOT! If you read the instructions on the prepaid cards it says dial 223 and send. But there is no way to dial from the Tattoo USB dongle. My second pet peeve - I called customer service and asked how am I supposed to reload and they told me the same thing "dial 223 . . ." I asked them how do I dial from this modem and got a moment of silence. Then they said take it out and put it in a phone and dial 223. Something tells me they really thought things through when they developed this. NOT! My third pet peeve - the customer service person then told me that I can dial from the modem if I get an upgrade, just download from the site. Now this was progress. When I went to the site it shows where to download the firmware upgrade, but gives you three choices of usb modem firmware to download - different depending on the model. No model number on the box or on the documentation. Finally looked at the USB modem and in really small letters on the back is the modem number. Would have been nice if they showed you where to look for it on the website. Scratch any plus points for customer friendly thinking. Last and biggest pet peeve - so I start the download then I see at the bottom of the page, not compatible with Macs. The firmware upgrade is an .exe file. All in all 4 big minus points - not customer friendly and certainly not Mac friendly. Sure there are lots of ways to get the load in (pasa load, load in a cellphone) but Its a pain to do. This service does not deserve patronage from Mac users.