Can I use my unlocked iPhone 4 with walmart family moble?

I have an iPhone 4 that I originally purchased from AT&T but it got too expensive so I got the phone unlocked and switched to metro pcs. The unlock was successful because when they put the SIM card in at the store everything worked and I've been using it for about 6 months now. Now I'm thinking about switching to walmart family mobile. Can I and do they have micro SIM cards? Also what would I have to do to transfer my metro pcs phone number to walmart family moble?

It will work with voice and texting. However, data will be limited to 2G and MMS may not work.

When you sign up, you need to tell the employee that you want to port your number. Your Metro service must remain active until the port is complete. Usually take s about 1-2 days.

Just get the micro-SIM from Walmart and tell them that you want to port your MetroPCS number to this new one. Once done, just put your FamilyMobile SIM into the iPhone and you're all set.