Does anyone know how phone can recognize callers number more than 7 digits?

I have tried 3650, 5210 and 3310 models. All work same way.

If phone 1 has number 050 1234567 and phone 2 has 040 1234567. Then third
phone saves both numbers and names to her phonebook. When third phone gets a
call, it won't recognize the number because it is too similar.

Is there any way to make phones use more than 7 digits?

My 3650 fw: 2.50 13-02-2003 NHL-8





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