Help needed with a Google Nexus 4 on Straight Talk with an AT&T sim card (can't receive mms)

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http://forums.androidcentral.com – I had Virgin Mobile locked in at $25/month and after moving recently the service wasn't very good in my house. I decided to switch providers and my phone was getting old anyway, so I made the switch to straight talk with an AT&T sim card from ebay for $50. I'm avoiding t-mobile for the same reason - it won't have very good service in this area. I used the APN settings listed on straight talk's website, and the data works, and I can send picture messages, but can't receive them. It's an annoying issue that I can't find a solution for. I've tried a few different APN settings, but none hav (HowTos)