Below are the 2 different types of gift cards that Verizon sells. The white one is the one you find at supermarkets and says "use for all your prepaid services." This can only be used for wireless prepaid and nothing else. Notice the back of it has only one number which is located under a scratch off (in the picture blow it is already scratched off.)
The black gift card (it also comes in gray) is the one you can use for fios. It is only sold on the Verizon website at link or in Verizon corporate stores. Corporate stores are the ones listed in the Verizon store locator list on the Verizon website with an * next to them. Notice the fios gift cards have 2 numbers on the back of the card: the gift card number shown under the barcode and also a pin number which is under the scratch off.
An important note on buying the gift cards from the Verizon Website: I HIGHLY SUGGEST NOT TO DO IT. There are hundreds of complaints on the Verizon forums that they send the cards unactivated and the number on the back of the gift card does not have a live person. I myself experienced this issue and I had to spend a lot of time before they finally fixed it. A TV Station in Kansas even did an investigation on the issue - you can see their report on this link.
A last note - if buying on the Verizon website (which I suggest not to do) you can buy in denominations of $25, $50, $75, or $100. In a corporate store you can buy for any amount you want - however, if you buy an amount other than the 4 standard ones, they charge a little extra. When I bought an $80 gift card they charged me $80.05. However, when I bought a $100 gift card in store, they just charged me $100.
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Wow, thanks for taking the time to post these helpful details!!
I will certainly not be buying any from the Verizon site...why am I not surprised it's a disaster? We love their services and they have been the most reliable by far but when it comes to their website and billing, it can be a nightmare.