if you have a friend with an unlocked phone (and who uses another service) you could try borrowing their phone, swapping the sim, and see if it works.
OK, while I am pretty much positive unlocked phones will work with Net10, I wanted to make sure this email they sent me isn't true before I spend over $100 on something that won't work.
Thank you for your interest in NET10 Wireless. We are responding to your recent inquiry. NET10 Wireless has a special prepaid technology that is built into each wireless phone. For this reason, you will not be able to use another GSM phone with our service, even if you install a NET10 SIM Card into it. In order to switch to our service, you will need to purchase a NET10 phone. NET10 phones and Prepaid Wireless Airtime Cards are available at most Target, Wal-Mart, KMart, Meijer, Seven Eleven, OfficeMax and other major retailers nationwide. You can also purchase on our web site at www.net10.com or contact our Direct Sales Department at 1-877-TEN-CENT. Should you have any other question or concern, please feel free to let us know. NET10 Wireless.
I just see this as a ploy do get me to buy a Net10 phone, even though I stated I was already a customer.
Like I said, I am pretty much positive, I just wanted to make sure.