Try these
on the Moment you Go>menu>settings>Wireless&Networks>DialUpNetworkin g checked Now you are in Diag mode
Sometimes on Samsungs after doin this it still wont read so you have to dial the ##8778# like the op said didnt work. Well you have to put them both to MODEM
Also make sure you have upgrade the android from 1.5 to 2.1
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