toString method
A string representation of this object.
Some classes have a default textual representation,
often paired with a static parse function (like int.parse).
These classes will provide the textual representation as
their string representation.
Other classes have no meaningful textual representation
that a program will care about.
Such classes will typically override toString to provide
useful information when inspecting the object,
mainly for debugging or logging.
Implementation
String toString() =>
"$runtimeType - timestamp: $timestamp, call_type: $callType, duration: $duration, number: $number, formatted_number: $formattedNumber, name: $name";