Pros: Simple as long as you have no issues. Good coverage. Obviously no contracts.
Cons: 1. Non-exsistant Customer service (worse than POOR!) So if you do have a problem you are sunk.
2. Sometimes call appears to go through and is charged, but actually has not completed. (and no refund) This is aggravating after 20 or so times.
Summary: I have used Net10 for over one year. The phone itself has been very good. I get good coverage all over. The signal is quite good (here in NE Ohio). We have a number of pockets between traditional providers here and this phone takes care of them all.
CUSTOMER SERVICE: HORRIBLE
As I write I am on hold to them for over an hour. You would think that something as simple as updating your credit card expiration date would be easy. Not with this company. Having previous experience with them I asked the CSR as he said he was transferring me to the "cue" to take the information, if it would be long. He answered, "No. I just spoke with them." Well, as I am still drafting this and still on hold. Read other peoples reviews about taking days and days on the phone to resolve issues.
They are, I believe, based in Costa Rica. So if you are willing to take a chance with a Central American Banana Republic phone company, go for it!
I use them because I do not want a contract. Read the other reviews about their poor customer service.