Nokia N91 User Manual page 10

such as MMS, browsing, e-mail and content downloading
via browser or over MMS, require network support for
these technologies.
For availability and information on using SIM card
services, contact your SIM card vendor. This may be the
service provider, network operator, or other vendor.
Enhancements, batteries, and
chargers
Always switch the device off and disconnect the charger
before removing the battery.
Removing the battery before switching off the device may
corrupt the hard drive.
Check the model number of any charger before use with
this device. This device is intended for use when supplied
with power from a DC-4, AC-3 and AC-4 charger and from
an AC-1, ACP-7, ACP-8, ACP-9, ACP-12, LCH-8, LCH-9, or
LCH-12 charger when used with the charger adapter
CA-44.
The battery intended for use with this device is BL-5C.
Warning: Use only batteries, chargers, and
enhancements approved by Nokia for use with this
particular model. The use of any other types may
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invalidate any approval or warranty, and may be
dangerous.
For availability of approved enhancements, please check
with your dealer. When you disconnect the power cord of
any enhancement, grasp and pull the plug, not the cord.