Please read just what richardarr states, for he & I are usually very accurate with our answer's plus we usually agree with each other. Always look for his review and/or answer to the question(s), as he's usually right on target. So, copy & past his link which will get you to the mobile wi-fi device you'll need to apply your service card to via straighttalk.com or their toll free # Mobile Hotspot at: 1-877-430-CELL(2355) . I have found their CSR's to be knowledgeable & helpful if you need any added help from straight talk. Plus you can usually find a well versed Walmart employee in their electronic's dept's world-wide.
Straight-talk also has a live human that you can click and chat with if you simply need directions, as this often spell's the step's out and you can save your conversation history with the live operator/CSR application & either refer back to it when needed or simply print out the log of your conversation and use that as future reference if you are uncomfortable saving it to your internet device.
Donna, this service card only works to provide service to the Straight Talk Hotspot. The Hotspot in turn can then provide a wifi signal for your tablet to use.
What you have to do is to first purchase the Hotspot which is currently being sold at Walmart for $79 (copy-and-paste):
Once you purchase the Hotspot, you then purchase this service card. When you apply the service card to the Hotspot, it will then provide a wifi signal for any device you may have that uses wifi ...i.e., your tablet, smartphone, laptop, desktop, etc.
It is your own personal wifi that can travel with you and provides a wifi connection just like Starbucks or a hotel, etc. would do when you travel. Only with this Hotspot, you have your own personal wifi source.