Sharp Corporation HRO00022 ユーザーズマニュアル

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Voice calling experience
When you use your phone on other CDMA networks, your calling 
experience and call quality will be similar to what you experience 
when making calls from within your home 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 voice calls, here are some differences you can 
expect:
You are more likely to experience static, cross-talk, fade-out and 
dropped calls.
Some voice calling features (such as Caller ID) that are standard 
within your home network may not be available.
Web service and Fax calls cannot be connected.
Security and privacy risks (eavesdropping and phone number 
cloning) are the same as those of the conventional analog 
cellular services today.
Battery life will be shorter when you use your phone for cellular 
roaming than when you use it on a CDMA network.
If you’re on a call and leave your home network service area, your 
call will be dropped. When reentering your home network service 
area while on a roaming call, end the call, and then turn your 
phone off and on again to acquire your home network Service.