Looking for Answers about Straight Talk Straight Talk Unlimited Minute/Unlimited Text Message/Unlimited Mobile Web Access/30-Day Service Card?

Absolutely, you can refill online. You can buy refill from Walmart.com online and they will email the PIN to you. Then you can dial 611* (send) to refill or go to Straight Talks webiste to activate the minutes (scroll to the bottom of their webpage)
https://www.straighttalk.com/Refill

There are several other options at the Straight Talk website, all required a credit/debit card:

You can 'refill on demand' using a credit card (no pin required).

You can setup a 'Reserve account' and buy as many refills as you like, use them on any Straight Talk phone you want to. You can use a Debit/credit card.

You can auto-refill (automatically charged to you debit/credit card every 30 days) and no PIN is required . With this option you get a free month after 13 consecutive billings, makes it even more affordable!

Visit the website:

https://www.straighttalk.com/Refill

You do not have to.
You can let it run out then start service again just by using the automated menu system.
You do not need to divulge personal info to a live person.
Buy the cards inside Walmart to save several dollars and keep one handy.
They are good for up to a year.
You can also buy a $30 card if you want.
DO NOT use auto-refill or buy a "card" over the phone.
A "card" over the phone will cost over $50 for a $45 card bought in the store.

Unlimited means unlimited. Not through a specific network, simply unlimited. All of my family and friends are on different networks and I've never had a problem. Also, StraightTalk is prepaid, so it's not like contract carriers where they can charge you fees. If you go over your minutes, your phone simply gets shut off, no hidden fees or anything. What you pay for that unlimited service card is all you are going to have to pay for that month, period.

no. eventhough they use the Verizon towers for service, i was told by strait talk that they use a different "data base" and that they can tell a Verizon phone from a strait talk phone!

Yes, you can buy minutes online. At straighttalk.com go to the refill tab and you can either refill on demand or set up auto-refill so money would come out of your bank account or credit card monthly and keep you from having your phone shut off. You can also call to refill, too, but I just found out that you can only refill through the phone during business hours. Online can be done anytime, same as the card.

My understanding is that service is provided through Verizon's Prepaid Service network.

No.

Yes , but you can buy cards to have on hand inside Walmart and not pay any taxes of any kind and the cards are good for up to a year to use.

Yes I have a tracphone that slides and I use the $45/a month card

Not that I know of.