HTC Dash EXCA160 User Manual page 23

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Model number of your device (T-Mobile Dash)
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SIM serial number (on the back of the SIM card)
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IMEI number (on the label under the battery)
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Agent code (on your service agreement)
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Your choice of T-Mobile rate plans and services
2.
Call Customer Care at 1-800-937-8997 from a landline phone.
Welcome to T-Mobile 23