Zte -C E520 User Manual page 51

You can reset the information such as Last Call, Incoming Calls, Outgoing Calls, All
Calls, etc. by pressing the Right Soft key [Reset]. Lifetime Calls, Total Messages
Sent/Received and Lifetime Data Counter cannot be reset.
Note: The call timers are not intended for billing purposes. The actual invoice for calls
and service provider may vary depending on network features, rounding off for billing,
rates and similar factors.
ZTE-C E520 User Manual
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