Questions: 1. Does the S2 from Walmart using the $30 plan (web and text, 100 minutes voice) support Wifi? (I ask because neither the Walmart site nor the Samsung site mentions Wifi for the T-Mobile version -- though I may have missed it). 2. Can Skype be used to make free calls using Wifi -- or are the minutes deducted from the T-Mobile limit? 3. If Skype can be used to make free calls (or calls to land lines using Skype credit), what is the reason to use T-Mobile's Wifi calling (which seems to use T-Mobile minutes)?