Ericsson R310s - Manual (Page 134)

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grammed functions, which cannot guarantee connection
under all conditions. Therefore you should never rely
solely upon any mobile phone for essential communica-
tions (e.g. medical emergencies).
Remember, in order to make or receive calls the phone
must be switched on and in a service area with adequate
cellular signal strength. Emergency calls may not be possi-
ble on all cellular phone networks or when certain network
services and/or phone features are in use. Check with your
local service provider.