My experience was a failure. I tried to port my old number and pay with a credit card. I created an account with them back in February and tried to buy. After repeated attempts and several chats the bottom line was to try one more time but use PayPal instead of Visa card. By the beginning of April I was ready to try again. I had finished my March 3 GB before finishing the March billing cycle. I really want the tethering feature too. I tried again. First step was three days to get the prior purchase attempts cleared from my account. Then the phone I had chosen was no longer available so I had to research them all over. Meanwhile, from February to April some things changed. It turns out Nokia is in Finland, Samsug is in South Korea. All other phones, including Motorola and Apple, are made in China.
I'm keeping my $35 Walmart Tracphone Samsung. Carlos Slim of Mexico owns América Móvil that owns Tracphone. It is $10 per month more than Visible Party Pay, only 3 GB, no tethering, but I know who is profiting from my business. To get cheap service from Visible I would have to buy one of the ZTE or Motorola phones they offer.