While it was alluded to in the iPhone 6 announcement, today T-Mobile is announcing WiFi Unleashed, which enables WiFi calling and texting for all Simple Choice customers and seamless hand-off of calls to cellular. In addition, T-Mobile is also partnering with GoGo to provide free text messaging and visual voicemail in flights that use GoGo to provide WiFi.

On the Personal CellSpot side, T-Mobile will give a free Asus 802.11ac WiFi router with 25 USD refundable deposit to Simple Choice customers starting on September 17th, which also acts as a femtocell and will provide signal to improve capacity and coverage of the network.

Overall, this seems to only extend the lead that T-Mobile already has with their extensive focus upon disrupting how mobile network operators do business in the US, and it'll be interesting to see what's in the Personal CellSpot.