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Sony Vaio SZ430 Laptop with Cingular Sim Card?

I have recently ordered a Sony Vaio SZ430 laptop and based on the write-ups from the internet, it has Cingular Sim card in the box. This is for connecting to WWAN. However I wont use this laptop in the US. can I use other SIM card or is this a tie up with Cingular, meaning this is a locked laptop (like cellphones). In the first place, does it work with GSM? Please help. Thanks!

yes you can but you must unlock the EGPRS (EDGE) modem. There is an unlocking procedure in sony us support website and at some point it is necessary to call them to get the unlocking code.
The procedure is rather easy to follow. See below. Since there is no hyperterminal in windows vista you must use another program that can send commands to the serial ports (secure crt, putty, etc)
1. Very IMPORTANT Before starting anything, make sure you have the ORIGINAL Cingular SIM inserted in your laptop. It will NOT unlock if you have any other SIM instaled..
2. Enable your wireless WAN. In Cingular Connection Manager, Choose Tools/Network Info, record the IMEI #.
3. Open Hyper Terminal and chose Start/All Programs/Accessories/Communications/Hyper Terminal. It will ask for a connection name. Type in whatever you want, Sony support recommends the name EDGE
4. Choose File/ProperitiesConnect To/Connect Using and select Sony Ericsson VDC EGPRS Modem (or COM4), click OK for the defaults which should be 2400 baud, 8 bits, no parity
5. Type AT and check if you get an OK echoed back. Note that the modem is case senstive, so you probably want to hit caps-lock to make sure you get capital A and a capital T
6. If you do, call Sony customer service and request an unlock code and you must have your model number, its on the lower right of your screen, Sony Support at 888-476-6972 (United States) or 239-768-7676 (International). At the time of the call, you must be with the notebook in order to provide information to a support representative.
7. Make sure you tell them you want to unlock your built-in EDGE modem and you need the NCQU number. (This is an eight digit number.)
8. Type AT+CLCK=PN,0,xxxxxxxx in Hyper Terminal, where the XXXXXXXX is your NCQU number and check if you get an OK echo from the terminal. Try it several times, if you don't get an instant OK, but do not hang up. If it doesn't work, check the IMEI and the NCQU with the CSR once again.
9. Close and Shut down Computer. Take out the Cingular SIM. Insert the other SIM.
10. Open SMARTWI and open up the Cingular Connection Manager.
11. Click on Profile. look for the ADD button at the bottom of the window. Click on Create Custom Profile
12. Fill these in for T-mobile or look up the GPRS settings for the country of your choice.
Service Type: packet or cicuit
Dialed: *99***1# ( leave it like that )
Acess Point Name: (internet2.voicestream.com)
Username: (LEAVE BLANK)
Password: (LEAVE BLANK)
13. Click next. On IP Settings leave everything on Automatic. Click Next again.
14. In the Profile Name slot, Type in T-Mobile or whatever you want your new carrier is. Then Click Finish
15. You're all set to Connect and when you come back to the US, you can switch back to the Cingular profile.

There are lots of different GPRS and data services and there's a sige that will tell you what connection you can use.

=====================================================================

How to perform the SIM unlock procedure after obtaining the unlock code.

Follow this procedure to unlock the Sony Ericsson EDGE module after obtaining the SIM unlock code.

NOTE: A SIM card must be inserted to perform the unlocking procedure. The Sony provided Cingular® SIM card, if activated, will still function after the Sony Ericsson EDGE Module is unlocked.

1. Click the Start button, point to All Programs, point to Accessories, point to Communications, then click HyperTerminal.

NOTE: If a Location Information window is displayed, enter your Area Code and then click the OK button.
2. In the Connection Description window, under Name, type EDGE.
3. Click the OK button.
4. In the Connect To window, next to Connect using, click the down arrow and click to select COM5.

NOTES:
* If COM 5 is not available, check Device Manager to determine the COM port assigned to the Sony Ericsson VDC EGPRS Modem and use that COM port instead of COM 5.
* If the Sony Ericsson VDC EGPRS Modem is not listed in Device Manager, ensure it is installed properly and turned on in the SmartWi utility.

5. Click the OK button.
6. Click the Configure button.
7. In the COM5 Properties window, ensure all the following settings are configured properly:
* Bits per second = 2400
* Data bits = 8
* Parity = None
* Stop bits = 1
8. Click the OK button.
9. Click the OK button.
10. In the HyperTerminal window, type AT

IMPORTANT: Use capital letters for all entries.
11. Press the ENTER key.

NOTE: Ensure OK is displayed on the next line after AT.
12. Type: AT+CLCK=PN,0,xxxxxxxx

NOTE: Replace xxxxxxxx with the unlocking key provided by the Sony representative.
13. Press the ENTER key.

IMPORTANT: If OK is displayed, the unlock was successful and the procedure completed.

NOTES:
* If a +CME ERROR 3 error is displayed, reset the EDGE Module.
* If a +CME ERROR 40 error is displayed, remove the SIM card provided by your third-party carrier and use the Cingular® SIM provided with the notebook.
* Consult the full list of +CME errors for more information on other errors that may occur.

http://129.33.22.7/SRVS/CGI-BIN/WEBCGI.EXE/,/?St=830,E=0000000000700452438,K=2447,Sxi=1,KB=CISCV3,VARSET_OBJ=513049,VARSET_L2=R513296,t=case.tem

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