AT&T today announced that it plans to add 2GB of data usage to its smartphone tethering plan. According to the release, current tethering customers will automatically get the additional 2GB of monthly data usage added to their plans at no extra charge as of February 13; customers who sign up for tethering afterwards will get the additional data from the start of their tethering plan. The total cost for 4GB of data plus tethering capability will…
