I just reactivated my net 10 phone on Monday and here are a few tips!

Firstly count on a long process! It took me about 45 minutes as I finally had to ask for a supervisor. After that it went a lot faster! Depending on how long your phone has been inactive determines if you need a new SIM card. My phone has been inactive since June but apparently I was still in the window, so I was able to put a 300 minute ($30) card on the phone and receive a new phone number while I was talking to the Net 10 supervisor. I did not have to have a new SIM card sent to my resort as I have had to do in the past when I reactivated my TracPhone. I believe they are the same company and I have never had to pay for a new SIM card. All you have to purchase is a new air time card, once you install the new SIM card.
As soon as I cross the bridge to the USA, my airtime display pops up on my phone and it resets itself, changing the phone number on my display automatically. When you talk to Net10 remind them you want to set up international calling so you can call back to Canada. Sometimes this feature requires several phone calls before they activate it properly. I find that Net10 and Tracphone are about the same. They works great when in the US and are so much cheaper than adding a new plan to my Canadian Bell phone.