[bairice]

This is the response I got from them:

"Thank you for contacting Sprint. I will be happy to assist you regarding
your delayed text messages.

I have refreshed some settings in our network to help clear out the
delayed text messaging problem. I would like you to power cycle your
phone to help keep your phone refreshed. You can do this by turning the
phone off and removing the battery for 1 minute. After 1 minute insert
the battery back into the phone and turn the phone back on.

If you continue to get delayed messages then a network ticket will need
to be opened for you so that our technicians can research the cause of
the delay. In order to open this ticket I will need you to provide me
with a number that is being delayed and the name of the carrier the
number belongs to.

If you continue to have problems with delayed messages please respond to
this email and provide the requested information.

Thank you again for contacting Sprint. We appreciate your business."

I haven't noticed any visible improvment (when I send a text, it takes 30 seconds to a minute to return, where as it is seconds when I force roam on verizon network) yet, so far haven't had any 30min type delays. I'll report back if I notice a marked improvement.