If you don't have a plan, you can just switch whenever you want for no extra cost. If you have a plan, it's 175$ to cancel it early. Most plans last 2 years so unless you want to pay 175$ cancelation fee, you'll just have to wait a year and a half.
I'v been watching tutorials on how to make a layout in photoshop for a webpage and then slice / export it but none of them tell me what size to make my photoshop element. What's a good size?