No Carrier Signal

I have downloaded the modem script for Motorola phones at taniwha.org.uk and have been able to get my phone to dial, but receive a "no carrier" message. I have contacted my airtime provider asking if they need to enabled data access for my phone. They basically tell me because I have a MAC they can't help.
Any further suggestions?

My cellular phone service is Cingular and my phone is a Motorola V551.
I have asked Cingular if my CSD is enabled. They have no idea what I am talking about.
I have purchased an additional plan for $19.99 a month that allows me to transmit 5 MB of data. I can cancel it at any time and it will be pro-rated. I only want to use this when I travel.
I have tried setting up GPRS. But getting a correct CID string from my phone carrier has been like pulling teeth. Everyone has been nice, but they have no idea what I am talking about. Below is the CID string info they gave me. I have do not know which string to use with what modem script I got off of taniwha.org.uk. But have tried several combinations.
1. Click the Modem tab.
2. Select the "desired modem".
3. Click on the Advanced tab.
4. Add the following dialing string AT+CGDCONT=1,"IP","proxy".
NOTE: Proxy is the default "Blue" network APN. For orange APNs, use "isp.cingular" or other APN as appropriate.
5. Insert modem into laptop and attempt to connect.
6. If unable to connect and receiving Error: "734 or 692" the initialization string needs to be amended. Try the following variations:
o AT+CGDCONT=3,"IP","proxy"
o AT+CGDCONT=1,"IP","proxy"
o ATCFUN=1;CGDCONT=1,"IP","proxy"
No matter what I do, I continue to receive the "no carrier detected" error.
HELP, please.

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If you are still having issues after attempting the troubleshooting steps in the previous article, see the following article:
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