Hi, well most likely not, however IF they were stored on a SD card IE: NOT in the SIM memory, then well maybe, if you try to use a SD card file/data/photo recovery program, use a PC & a USB SD card converter, and well you might be able to get something back, again, ONLY, if NO other data has been written to that area where the message data was stored to begin with after the deletion.
There are many recovery programs just Google for one, and try it. software links below.
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www.ehow.com > Computer Software
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www.filerecoverytools.com/products/fr_sd/
Whenever a item is deleted seldom is the actual data wiped out so to speak, usually all that happens is the file is "Hidden", so the the operating system cannot "See' it. This is done by simply substituting the first character of the files name, with a non-printable character, such as a $, %, #, etc, and this then makes it invisible to the system, while actually still being there, eventually though this area will be overwritten, this will then of course remove the old file entirely, or nearly so.
you first need to find out what the file extension, is used so that you can search for it with the recovery software if you are able to.