Free phone service FreedomPop is serving up a $20-a-month all-you-can-eat option. Unveiled on Thursday, the new “Unlimited Everything” plan offers unlimited talk, text, and data for the $20 monthly fee. The only apparent drawback is that once you consume more than 1GB, your data speed drops from 4G to 3G. Free tethering is also included with all new LTE phones to turn them into wireless hot spots. Founded in 2011, and initially backed by Skype co-founder Niklas Zennstrom, FreedomPop offers free but limited Net-based phone service (as well as Internet access) by way of wireless broadband. It also offers paid phone plans that include more voice and text but still cap the data (the Unlimited Everything plan does away with the data limit). The company’s services are available only in selected areas.