U.S pay as you go plan

I'm going to be traveling to the U.S and I was looking at picking up a pay as you go sim card since my Z30 is unlocked. Would anybody be able to suggest a decent one? All the ones I've found seen to expire after a certain amount of time. Are there any that don't expire and I could use whenever I out money on them? I'm in Canada btw

Posted via CB10 on my Zee-Tree Zero!

I use Roam Mobility. They sell their sim cards pretty much in every 7Eleven stores.
You can buy from 1 day to a month of call, text and data. All calls and text from the US to Canada are included.
I visit the US very often and really like the service.

The sim card is good for a year since last charge, so al long as you remember to top it up before the end of the year you're good to go for another one.

Posted via CB10