Sorry in advance as I'm sure this is a popular topic, but I was not able to find a match using the built-in or Google search.
Is there such a thing as a prepaid data SIM that does not expire? My company bought me an AT&T iPad which I use several times a week over Wi-Fi. It is not currently setup with a cell plan. There are times that I travel without Wi-Fi access and would like to take it with me. I have the bare minimum plan on my phone and don't think tethering is possible. If I could spend $25 or $30 to buy some data that does not expire it would be nice to have in my bag as an emergency connection. Everything I have found is $X per YGB of data expiring every month OR add to your cell plan for an additional $X per month. I wouldn't use it enough to warrant the monthly expense, just looking to have a few GBs stashed away incase I need them in the future.
Thanks in advance for any guidance.