Samsung SCH-3500 - Manual (Page 30)

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What you’ll see.
You should always check your phone’s display because it
will let you know when you’re outside the Sprint PCS
Network and whether your phone is operating in analog
cellular or digital mode.
Sprint PCS Network - no icons display
Other CDMA Networks - displays
Analog Cellular Networks - both and display
Note: Always dial using 11 digits (area code + number)
when calling from outside your Sprint PCS Home Service
Area.
Voice calling experience.
When you use your phone on other CDMA networks, your
calling experience and call quality will be quite similar to
what you experience when making calls from within the
Sprint PCS Network. Although certain voice-calling features
may not be available, your phone calls are still private and
secure.
When you use your phone on analog cellular networks,
your experience will be different. Cellular roaming will be
similar to the quality provided by conventional analog
cellular carriers today. Although you will still have the
convenience of being able to make and receive calls, here
are some differences you can expect:
You are more likely to experience static, cross-talk,
fade-out, and dropped calls.