this is assuming that you have already loaded the arcsoft mms program onto your phone.. if not you will need to do some searching to find it... but since you said you were having problems getting it to download pictures,, im going to assume you have it on there.. so here you go...
go to Start/settings/connections/connections/advanced/select networks
once you get in there then click on add new modem connection and name it Cricket WAP and the modem should be Cellular Line and press next
on the next screen put #777 and click next
enter your User Name is firstname.lastname@example.org
and passwork is cricket and click finish
now go to proxy settings and check both boxes and write wap.mycricket.com on proxy server
now go to advance and write wap.mycricket.com on the server and 8080 in the port(do it in all 4) now click ok until you go back to network management
now on the second one click new and name it Cricket mms and celular line and click next
do step 5 & 6 again.
now you are done with the connections settings
For the next step you will need a registry editor
You can find phm regedit for free or use resco registry editor from resco explorer pack,, they have a demo
open it and go to Hkey Local Machine/software/arcsoft mms ua/config/mm1/wspheader
look for these strings and make sure they say this,, if not then edit them to be like this....
X-Cricket-MDN your phone number(you might have to replace sprint to Cricket)
if you missing some of them, go to edit/ new string
and if there are other stuff on there besides those 4, delete them
Now go back to Hkey Local Machine/software/arcsoft mms ua/config/UI
and change it from 0 to 1
now you need to soft reset your phone...
now go to your messages and click menu/MMS configuration and then click server and click add new,, add new or if you already have one called verizon or something,, just click it and click edit...
you need to change/input these settings into it
Server Name Cricket
Gateway leave blank
Port Number 8080
Server address http://mms.mycricket.com/servlets/mms
Connect Via Cricket MMS
Sending limit (your choice)
Wap version Wap 2.0
Mine is working great.