Sanyo SCP-4000 - Manual (Page 26)

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If you are on the phone when you leave a Sprint PCS Service Area
and enter an area where roaming is available (whether CDMA or
analog cellular), your call will be dropped. If your call is dropped
in an area where you think Sprint PCS provides service, turn your
phone off and then on again to acquire Sprint PCS Service.
If you need Sprint PCS Customer Service for any reason while
using your phone outside the Sprint PCS Network,
dial 1-888-211-4PCS (4727).
Sprint PCS periodically implements new roaming agreements.
To ensure your phone is able to roam everywhere Sprint PCS has
roaming agreements, stop by a Sprint PCS Center periodically for
a free roaming software upgrade. For a complete list of roaming
cities, visit our web site at www.sprintpcs.com.
Setting your phone’s mode
Three different settings on your phone allow you to control you’re
roaming experience. See page 46 for more details.
Call Guard
This feature reminds you when you are making or receiving a
roaming call so you can control your roaming experience.
See page 47 for more details.