I was just checking out a website called holidayphone.com. what they do is send you a sim card for your phone that allows you to keep your cell # and use it while traveling. It's a flat fee of $54 and change for 1 hour talk time while in Mexico. You can add 1gb of data for another $15. Compared to what I've spent in the past using my phone, this is pretty good, so I'm wondering if anyone has had any experience using this company?