Pros: *From the Law!
You can get a phone number with any area code, great if you want to say you're from LA (323) or Las Vegas (702)
Cons: If you don't buy more airtime by your due date - even if you have plenty of minutes left - you lose all those minutes AND YOUR NUMBER.
Summary: You will be deactivated for two reasons:
1) Run out of minutes (unable to place or receive calls)
2) Fail to renew by due date even if you have minutes left (phone is disabled and you lose your phone number)
SO just buy airtime regularly, right??? Not so simple. Here's something not advertised on the Net10 site: If you buy too early, you lose days of service. Example: Let's say you buy 30 days, and a week later buy another 30. You get not 60, but only 37!!! This is because your new 30 days starts when purchased.
So you want to renew as late as possible, right?!? Well, here is the GOTCHA. Their website is highly erratic and their CS is hostile, thickly accented and only works business hours. So if you push your luck (trying only to get all the days of airtime you paid for) you risk losing your minutes and your number.
On top of that the service is pronbe to dropouts and of rough quality. I only recommend Net10 to people who need disposable phones: fugitives, spies and people on the Witness Relo Program.