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i9020a data connection is horrid on AT&T (77kbps)

gnychis

Lurker
I recently got a used i9020a for AT&T and for some reason it continually drops its data connection. I immediately put Koush's latest CM9 release on it, I am not sure I even have stock firmware for it (got it used with other custom ROM on it). The bars do not drop, the bars stay at full connection, but the data completely halts to and from the phone it seems like. I cannot even download a 2MB file without it stopping half way. Then after a minute or two, the data connection will come back only to drop again.

It basically makes the phone entirely unusable.

It is using my iPhone 4S SIM card (I would like to switch between phones).

I tried to run a speedtest.net speediest, and here are my abysmal results:
Code:
Ping: 1333ms
Download: 77kbps
Upload: 10kbps

What??????

If I pop that SIM in my iPhone 4S, my results are:
Code:
Ping: 98ms
Download: 3.2Mbps
Upload: 1Mbps

I am running Koush's latest CM9 release:
Code:
Network: AT&T
Mobile network type: HSDPA:9
Baseband version: i9020xxkb3

My APN is setup as:
Code:
Name: ATT
APN: wap.cingular
Username: WAP@CINGULARGPRS.COM
MMSC: http://mmsc.cingular.com
MMS Proxy: wireless.cingular.com
MMS port: 80
MCC: 310
MNC: 410
APN type: default,supl,mms
APN protocol: IPv4

Does anyone know what is going on here?

EDIT: tried a second ROM, still the same speed issue.
 
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