To send and receive mms you must have a cell data connection. If u are on wifi, when u hit send the wifi and cell symbol will show at the same time. If u disable mobile data and are on wifi it will fail. At least this is my experience.
Sent from my Galaxy S III
Not sure but this may be per carrier. On sprint if I'm in wifi it will use my wifi connection to send the MMS and then sprint takes it from there and sends it off. If I'm on 3g a picture can take 20 seconds or so... On my home wifi it takes 1-2 seconds.
Sent from my Sprint S3 using AC forums
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