Omg...You flashed and rooted your droid and can't do any calls what-so-ever? Ok...Troubleshooting steps.
1a) Make sure your account is paid up.
1b) Dial *228 and type what happens (Does the programming complete or does it say something like "Could not program your phone")
2) Find the MEID from the phone's software menus, not the back of the phone. Sometimes the MEID will be different...it shouldn't be but it could be.
3) Once you know your MEID, call up MetroPCS and verify with them that the MEID on your phone is the same that's on your account.
4) If in 1b the phone does complete programming, check the PRL section of the Phone info and verify that the prl is actually there. Sometimes some phones don't like the PRL pushed to it.

There's some help respond back with the answer to 1b if you would after you've checked the other things