Mobile phones take and display pictures in a wide variety of resolutions and file formats. Many phones can't display some of these pictures from different models because their display resolution is not compatible.
Do you have this problem on every MMS received (from different users), or is this an intermittent problem?
It sounds like you are receiving an MMS forwarding message, where the content of the message is actually stored on a web server that you log into with the information that was forwarded to you.
Please check the following MMS settings on your phone and verify that they match:
From the standby screen, press the Menu Key.
Scroll to "Settings," press Select.
Scroll to "WebAccess," press Select.
Scroll to "Web Sessions," press Select.
Scroll to "Cingular MMS" press Menu.
(if not there select "new")
Scroll to "Edit," press Select.
Validate the following parameters:
Name: Cingular MMS
Service Type 1: HTTP
Gateway IP: 126.96.36.199
Port 1: 9201
Domain 1: leave blank
Service Type 2: WAP
Gateway IP 2: 0.0.0.0
Port 2: 0
Domain 2: leave blank
DNS 1: 0.0.0.0
DNS 2: 0.0.0.0
Time out: 5 minutes
CSD no 1: leave blank
Username: 1: leave blank
Password 1: leave blank
Speed (Bps) 9600
Line Type 1: ISDN
CSD no 2: leave blank
User Name 2: leave blank
Password 2 leave blank
Speed (Bps) 2: 9600
Line Type 2: ISDN
GPRS APN: wap.cingular
User Name: WAP@CINGULARGPRS.COM
Scroll to "Messaging," press Select.
Press the Menu key.
Scroll to "Inbox Setup," press Select.
Scroll to "MMS Message Setup," press Change.
Scroll to "Server Info," press Change.
Scroll to "MMS", press Menu key.
Scroll to and select "Edit".
Validate the following settings:
Service Name: MMS
Server Name: http://mmsc.cingular.com
Web Session Name: MMS