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I have a unlocked GSM Treo 600 and it supports 2 lines of service.
I use T-Mobile and the option is in the Phone App under Options / Change Line.
I'm not sure if it is a SIM card option that the Treo sees, or a normal GSM option.
I only have one line of service and there is a "1" one next to the signal bar. If I select the 2nd line, a "2" appears next to the signal meter. Phone calls coming in to line one show "Line 1" on the screen along with the caller ID information. If I try to call out on Line two I get a T-Mobile message stating that I'm trying to use a restricted service.
Also, there are two lines listed on the Phone Info screen (Phone App, Options / Phone Info). Line 1 contains my phone number and Line 2 contains "Number not on SIM".
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