Kryptcall arrives in three files, the sis file, a registration and a security key file.
The programme uses the data channel to carry your voice communication.
The data channel is also called CSD. You will need to get your CSD number from
your network provider.

O2 has currently the most reliable CSD network in the UK.
This is why our standard Kryptcall range should be used on O2.

The latest Kryptcall version takes advantage of the more powerful Nokia Symbian v5
handsets. These new set of phones enable Kryptcall users to make successful
voice calls across the data channel of most networks in the UK.

Ask your mobile network provider for your CSD number, they will understand
your request better it if you ask for a fax number instead of your CSD or data
number.

Step by step instructions:
Before you install the files, your phone needs to be set to

- the correct time and date,
- the phone needs to be taken off 3G mode and has to be
set to GSM mode. To do so, you will need to
go to Tools -> App. Manager, choose Options -> Settings and set
- Software installation to All and
- Online certif. check to Off.

Please restart the phone and then install the files.