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Ok how happy would you be if I found your 38499 prl file and sent it to you!!!!!

LOL I hope it works for he been trying so hard to get it going you know
Full internet working requires the broadband trick.
If you get a Broadband card from Cricket, and downgrade your Cricket plan (to get rid of Web, to the cheaper one, unless you need roaming!) then you can do it.
It requires putting in the phone numbers and information for your Broadband Card into ##778 instead of your normal one.
You can use APN Backup & Restore to get MMS to work, but if you're using the broadband card trick, you can't get MMS to work either way.
In both cases, the broadband trick is necessary for full functionality.
The only way otherwise would be if there were a way to channel ALL network traffic through wap.mycricket.com:8080, but I'm pretty confident that it only allows you to request http traffic on port 80.
There is no way around this, that I've even heard of.
So, as such, NO phone is fully functional on Cricket the way the Eris is on Verizon. They aren't set up for it.
Theoretically, you could get your number to also have the access a Broadband Card has, and see what happens. I doubt they'd let you even try, though. There might be a technical reason why you can't, as well.
Who knows.
Okay, so it appears there is a solution to the Cricket proxy issue on the Eris that doesn't require a broadband account...however it's like pulling teeth to get someone with the knowledge to provide some assistance.