Samsung SPH-a500 Series - Manual (Page 95)

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Storing your phone
You must not store or carry your phone, its parts, or accessories in the same
compartment or other area where there flammable liquids, gases, or explosive
or flammable materials.
Cautions
Any changes or modifications to your phone not expressly approved in this
document could void your warranty for this equipment and void your authority
to operate this equipment.
Only use approved batteries, antennas, and chargers. The use of any
unauthorized accessories may be dangerous and will invalidate the phone
warranty if said accessories cause damage or a defect to the phone.
Although your phone is quite sturdy, it is a complex piece of hardware and can
be broken. Use common-sense guidelines to avoid dropping, hitting, bending,
or sitting on it.
Your Phone as a Network Device
Your telephone requires a service provider to send and receive calls. Your
phone is only one part of a system or “network” of devices that makes it
possible for you to send and receive calls, text messages, voice message, access
the Internet using the minibrowser, and to take advantage of all of the other
services and features available when your phone is used with your service
provider.
Your phone will always try your call using your home system, but if this is
unavailable, then the phone will use the preferred roaming system.
If you cannot roam, your call will not be connected and the icon is
displayed. In some service areas, an operator may come on the line asking you
how you would like to pay for the call.