Sanyo SCP-4000 - Manual (Page 24)

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Note: In areas where Sprint PCS does not have a roaming
agreement in place, you will still be able to make (but not receive)
calls using a credit card. This is called manual roaming.
What you will see
You should always check your phone’s display because it will let
you know when you are outside the Sprint PCS Nationwide
Network and whether your phone is operating in analog cellular or
digital roaming mode.
The chart below indicates what you will see, depending on where
you’re using your phone.
Regardless of whether you are using your phone on or off the
Sprint PCS Nationwide Network, you should always dial numbers
using 11 digits (1 + area code + number) when you make calls.
(This does not necessarily mean you’ll be charged a long-distance
rate.)
Sprint Network
Other CDMA Networks
Analog Cellular Networks
(Roaming Indicator)
(“Digital Roam” displays.)
(“Analog Roam” displays.)
A
(Analog Indicator)
A