Samsung :: A707 Data Plan And Tethering Settings For Sync

I currently have ATT cellular service and I am currently using the Samsung SGH A707 Sync. I plan to tether to my laptop and would like to get the $15(200 Meg) or $25 (2GB) data plan. I have previously used the unlimited data plan and tethered to a LG CU500 about two years ago.I recalled setting up the dialup connection (via Bluetooth) with
username: WAP@CINGULARGPRS.COM
password: CINGULAR1
and dialed *99#
Are those parameters the same now if I use the A707 sync? Or did ATT changed those parameters already?I have also noticed that the A707 Sync has a different connections setting than what I used previously on the LG CU500. There are FOUR types of connections setting in the A707 Sync. They seem to have been preset. Here are the connections settings:
1. MEdia Net wap1.X
wap.cingular
Auth Type: Secure
WAP@CINGULARGPRS.COM
password: ********* (presumably CINGULAR1)
Protocol: WAP
Gateway address: 66.209.11.61
2. MEdia Net wap2.x
wap.cingular
Auth Type: Secure
WAP@CINGULARGPRS.COM
password: ********* (presumably CINGULAR1)
Protocol: HTTP
Proxy address: wireless.cingular.com:80
3. AT&T MMS
wap.cingular
Auth Type: Secure
WAP@CINGULARGPRS.COM
password: ********* (presumably CINGULAR1)
Protocol: HTTP
Proxy address: wireless.cingular.com:80
4. AT&T IMS
ims.cingular
Auth Type: Normal
Protocol: HTTP
Proxy address: 0.0.0.0:80
What are the differences between the settings and which of the four would the appropriate connection setting for tethering to the laptop?Lastly, my main task would be somewhat routine (checking email/check ebay item/bank account/paying bill) using the data plan probably around 3 times a day for no more than 5-10 min.
Should I get the $15 or $25 data plan?