I just received my MINT SIM card and installed it. It worked without having to set up the information on the APN in the settings.
I did fill in the information, however, the instructions were a bit different in my phone's settings and I had to try several times to fill in the required information in the APN settings.
I've made a few calls and they're pretty clear and the data is very good. I can't wait to take use it when I travel out of my region (Rio Grande Valley Texas), when I travel to the Austin, Texas region.
I was reluctant to call customer service, since I'm sort a of a techie type of person and decided to fill in the instructions on my own and it worked. I love saving money and hope that the low cost for service will last a long time. Try it during the 7-day guarantee period.