Shop around before committing. There are many carriers offering 4G hotspots and/or tethering to a phone plan. You need to decide whether to buy a "plan" (2 year commitment) or go monthly. I strongly prefer the latter. WalMart has some exclusive deals that are sometimes a little better than elsewhere, so have a look there. I recently switched my cell service to T-mobile monthly plan - "unlimited" data and text, 100 min talk for $30/month. (I use Skype for phone calls above 100 min.) This plan is available at WalMart or Tmobile.com only. With an unlocked Android phone, you can configure your phone as a wireless hotspot on this plan if you don't get caught. T-mobile also has hotspot plans that are fully legit.