Will this work, without a data plan?

MMS APN: wap.voicestream.com
Username: [Leave blank]
Password: [Leave blank]
MMSC: 216.155.174.84/servlets/mms
Proxy: 216.155.165.050:8080
MMS Max Message Size: 307200 (300kb limit)
MMS UA Prof URL: wap.sonyericsson.com/UAprof/W800iR101.xml (meant to fix the small image size issue but doesn't seem to be working)