Unlock Tmobile's Apn on HTC One S

[Android Question]

I Have an HTC One S from Tmobile that I'm trying to get on Straight Talk. I've tried Tweakker, Apn Backup and Restore (which isn't compatible with 4.0 phones), changed my apn settings to the ones ST gave on their web site, changed it to one's other people were getting there phones to work on. That includes the apn type to default and so on and so forth but NADA. I can get on the internet but I have NO service, so I can't even call ST to see if they can help. And my phone keeps telling me I have an invalid sim card, but it won't bring up a "unlock pin" screen (to unlock my phone). I've been at this for 6 hours, someone please help!

 

[KOLIO]

If you're under a contract w/T-Mobile & the phone, that may be the problem.

If that's not the case, have you contacted HTC/T-Mobile for unlocking assistance?