My TMFL two LG500Gs used a website (simplewireless I think), and I used previously activated phones. The site added my 1400 minutes, 365 days, and TMFL to the old phones (were DMFL) . Took about 30 minutes to go through.
The S390Gs, transferred from LG500Gs/T404G on the TF site. Took 5-15 minutes. Then called simplewireless and the 1400 minutes and 365 days were added in about 30 minutes.
No PIN in any instance. Just the phone number, order number, and zipcode.
Seperate call/visit required for phone number/order number.