How to config the Sigma X-SIM mode:

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To change the operation mode of your Sigma card insert it together with a simcard that got a 4 to 7 digit pin code activated to your phone
(can be a locked or unlocked phone - both are ok) and power the phone on, the phone will ask you as usual for the pin code,
enter your 4 digit pincode followed by the special 4 digit operation mode and press enter, sigma will from now on work in this mode,
if you want to change the operation mode just repeat this operation.

The 4 digit decimal operation mode defines which imsi reads get replaced by the SIGMA X-SIM
The operation mode will be converted to a 13 bit mask by the Sigma card

Examples:
0000 = No read will be altered (SIGMA is basically deactivated in this mode)
0001 = The first read will be replaced (Most Nokia, Samsung, Motorola...)
0002 = The second read will be replaced (Few Nokia models, especiall N Series)
0003 = The first two reads will be replaced
0004 = The third read will be replaced
8185 = For most sharp models (this is the default configuration)
8191 = TMSI mode (patch all imsi reads)

Let's take out two examples:
0001 (dec.) = 0000000000001 (binary) Means the first read will be relaced
8185 (dec.) = 1111111111001 (binary) Means all reads except the 2nd and 3rd will get replaced

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