SMS Not working in Galaxy S3

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http://forum.xda-developers.com – Hi, my SMS funktion stop working with outgoing SMS according to my service provider it´s because the phone is set to GMS/GPRS when it should be GPS/UMTS. I cant find where to change this and i cant find any info on Samsungs support site. Can sombody please help me with this i vill be very greatful. Samsung Galaxy S3 3.0.38-Siyah-s3-v1.4 Omega v10 - XXBLG6 (HowTos)