Sprint has let users on Google Voice to receive MMS messages through Gmail. T-Mobile is following suit today, adding the feature to their own network, and making Google Hangouts an even nicer looking option. Verizon and AT&T have not mentioned anything yet regarding an update.
Alex Wiesen, a Google employee, posted some information regarding the news on his Google+ profile.
We’re happy to announce this week another step towards improving MMS support for Google Voice. T-Mobile has allowed MMS messages from their users to be sent to Google Voice users. Similar to MMS messages from Sprint users, these messages will appear in Gmail, and you can be notified of the message via SMS. We continue to work with other carriers to broaden support for messaging and bring MMS to Hangouts. More good things are coming!
Sounds good, and we’re looking forward to seeing what other great features are brought to Google Hangouts in the future.
Source: +Alex Wiesen