Making Calls - LG MM-535 Owner's Manual

Your phone's display screen always lets you know when you're off
the Sprint Nationwide PCS Network and whether your phone is
operating in analog or digital mode. The following chart indicates
what you'll see depending on where you're using your phone.
Sprint Nationwide PCS Network
Other Digital Networks
Analog Networks
When you're roaming on digital networks, your call quality and
security will be similar to the quality you receive when making calls
on the Sprint Nationwide PCS Network. However, you may not be
able to access certain features, such as Sprint PCS Vision.