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manually enter the APN settings
Settings > more > mobile networks > access point names > menu > add New > enter the info > menu > save
google APN android settings "name of your network/carrier"
Double check your APN settings
Settings > more > mobile networks > access point names
or
settings > xperia > internet settings
Keep in mind that you can only send and receive MMS if you have a data plan, this wont work with WiFi
Turn off your wifi and try this
Settings > Xperia > Internet Settings > dowload settings > select your carrier/network > wait
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