Yes. Both Motorola's site and t-mobile's site say that MMS works with the CLIQ. Those 3's out to the side of options below mean that additional charges may apply, such as data and/or text messaging plans.
EMAIL3
POP3/IMAP embedded, Support for MS Exchange
MULTIMEDIA MESSAGING (MMS)3
Animated GIFs
TEXT MESSAGING (SMS)3
Compose messages using rich text
IMAGE FILE FORMATS
BMP, PNG, GIF, JPEG
INSTANT MESSAGING (IM)3
supported
VOICE MAIL3
Standard Voice Mail, Visual Voice Mail