So even if the delay indicator is green, there is always a
certain noticeable delay, much like on some transcon-
tinental phone calls. If the overall line quality becomes
bad, the delay rises and you may experience »drop
outs«. Note that the quality on international calls might
not be as good as on domestic calls. The multiple op-
erators involved in an international call often try to
minimize their costs by technical measures that can
affect the quality of the call. If the call quality is unac-
ceptable, please try calling again. Call quality can also be
adversely affected when using certain GSM providers.
If the Delay indicator becomes reddish or red, please
try to find a place with better GSM coverage. Use the
signal strength indicator on the right upper side of the
display to find a better spot. If the delay indicator turns
and stays solid red, please hang up and set up the call
again. When no call is in progress, the delay indicator is
shown grey.
Switching the Calltype
Normally, the CryptoPhone uses the V.110 circuit
switched data (CSD) - also called digital data call -
bearer type to establish a secure connection. To call to
an analog landline or to a CryptoPhone on a satellite
network or a network with weird data-call configuration
CryptoPhone G10 User Manual
10
Security Advice regarding Flash Mem-
ory
With the GSMK CryptoPhone, various information is
stored in Flash Memory. Flash type storage is safe
against failure of the backup-battery. You must how-
ever be aware that there is no way to securely erase in-
formation stored in flash memory in a way that it can-
not be possibly reconstructed by sophisticated methods
of computer forensics. Even if you erase the informa-
tion and overwrite it with other data, it cannot be con-
sidered safely destroyed when stored on Flash Mem-
ory. Flash memory uses its own way of managing files
that is beyond the control of the operating system.
So files that are no longer visible after deletion in the
file manager may still exist in some unused part of the
Flash memory. In addition, esoteric physical effects
( " memory burn in " ) make it possible for a forensic in-
telligence laboratory to reconstruct the former content
of Flash memory, even if it has been erased or overwrit-
ten once. The same problem holds true for (mini)SD
memory cards, because they are also based on flash
memory technology. We therefore recommend that
any potentially compromising information is not stored
in the Flash Storage if there is a risk that the device may
fall into the wrong hands.
CryptoPhone G10 User Manual
19
