Samsung SPH-M620ZKASPR - Manual (Page 225)

Section 2I: Using the Built-in Camera 199
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3. Enter your wireless phone number (without hyphens)
into the Sprint Phone Number field.
4. Click the No, send me a Password button.
5. Click the Sign on button. An onscreen message appears
notifying you that a text message containing your
temporary password was sent to your phone. This
system-generated password is used to activate Picture
Mail on your phone (step 15).
6. Select Menu > Messaging > Text Message > Inbox and
press .