What do you mean you did PRL flashing through CDMATool's website? You have to use DFS.
By the way, can you check at Settings > General > About and click on the Carrier tab, it should show what PRL your phone currently has installed. If it says 2004 that's the older 2008 PRL that MetroPCS uses for all flashed phone over the air and if it says 302x then it just means your area does not have 3G service. It's more likely the contrary however as I can see that Dallas, Texas is a 3G supported area. You just haven't flashed the PRL.
To use DFS you have to pay $100 by the way, it's not going to let you do anything without doing so.
If you don't want to get internet yet and just want to flash your custom PRL, just use the file-system method I described a couple posts ago.
Verizon iPhone 5 32GB black unlocked
PagePlus iPhone 5 16GB black unlocked
T-Mobile Samsung Galaxy Note 2 16GB Titanium
T-Mobile Samsung Galaxy Note 2 16GB Titanium (2nd)
T-Mobile Samsung Galaxy S3 white (cracked)
AT&T iPhone 4S 16GB white (cracked)
PagePlus iPhone 4 16GB
MetroPCS iPhone 4 16GB (cracked, non-usable)
AT&T iPad 3 16GB LTE (somewhere in the house)
iPad mini 32GB white
iPod touch 5 32GB blue
iPod touch 4 8GB white (missing display, non-usable)
Blackberry Bold 9700 AT&T