There are many websites that list what a GB will get you. Without steaming video you will not se as much as you might think. Over 30 hours of steaming music is only 1GB...one HD movie is over 1gb though (1-2GB) Websites, Email and anything that isnt steaming does not take to much. Get 10 for the first month, the hotpot displays usage so you can monitor as you use it. Try to use it as you normally would and use that first month to fine tune your plan. Most smart phones have hotspot built in. If you use Verizon the feature is free (just uses the data)