WAP (t-zones) & MMS Not Working - Samsung E335 on T-Mobile

I'm a longtime T-Mobile subscriber, but I don't have a camera phone.

A family member loaned me their Samsung E335 so I could take some
photos and e-mail them using MMS. The phone works fine on voice calls
and receives SMS text messages (< 160 chars) without any problem, but
nothing that relies on MMS or WAP is working (can't send/receive photos,
and can't access T-Mobile's t-zones home page).

T-Mobile says that when you send your first photo message, the system
provisions your SIM to allow incoming MMS messages as well, but I still can't
send or receive long text (>160 chars) or photo MMS messages.

The phone shows that incoming MMS messages are waiting, but when I try to
retrieve these messages, after a few seconds it displays a "Network Unavailable"
error. Same error when trying to send a photo using MMS.

At some point during the support call to T-Mobile, I got a "HTTP request fail" error,
perhaps when they had me try to access t-zones. Again, voice calls work fine. This
does not appear to be a signal strength or coverage issue. I believe it is a
configuration issue.

I used the phone configurator on T-Mobile's website to "push" WAP and MMS
configurations to the phone, and I've used the *#VSWAP# and *#VSMMS#
keyboard commands to get into the service menus and check the configuration
on the phone.

I called T-Mobile's customer support, which is always an adventure. After they
"pushed" an update to the phone, I could get to the t-zones home page,
which I guess meant that WAP was configured correctly, but I still could not
send any MMS messages containing photos ("Network Unavailable"). They had
me do a reset on the phone, but all that apparentlydid was cause WAP to
stop working once again. So now I'm back to where I can't access t-zones,
and I still can't send or receive photos using MMS. T-Mobile's 2nd level
support couldn't offer any further help.

I don't know what their support rep sent to the phone to get WAP working
(until we reset the phone), but the "push" messages I sent to the phone
when I used T-Mobile's handset configurator contained the following
parameters...

For the MMS PUSH...
Profile Name: T-Mo MMS
Bearer: GPRS
IP Address: 216.155.165.50
IP Port: 9201
URL: h t t p : // (remove spacing, followed by) 216.155.174.84/servlets/mms
APN: wap_voicestream_com
(I'm showing periods as underscores to keep forum software happy)

For the WAP PUSH...
Profile Name: T-Zones
Bearer: GPRS
IP Address: 216.155.165.50
IP Port: 9201
URL: h t t p : / / (remove spacing, followed by) wap.t-zones.com
APN: wap_voicestream_com

The phone's GPRS settings are as follows...
IP: 216.155.165.50
Port: 9201
APN: wap_voicestream_com
Login ID: (blank)
Password: (blank)
Bearer: GPRS only

Can anyone offer any insight as to what might be the problem ??? The only
suggestions T-Mobile's 2nd level support could offer was to try replacing the
SIM card or replace the phone.

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