Samsung SGH-T739TSATMB - Manual (Page 13)

Getting Started 10
Activating Your Phone
3. Press the battery down until it clicks into place (2).
4. Make sure that the battery is properly installed before switching on the
phone.
5. Reinstall the battery cover by sliding it back onto the phone until you hear it
securely click. Make sure the battery is properly installed before switching
on the phone.