Default ATT Samsung Galaxy S3 support for LTE Band 2 and LTE Band 5

The ATT Samsung Galaxy S3(I747) has the Qualcomm Snapdragon S4 plus MSM 8960 processor. The Qualcomm MSM 8960 is capable of supporting LTE band 17, Band 4(AWS), Band 2 and Band 5. ATT has now launched Band 2 in NYC and Band 5 in the Midwest.

The S3 only supports LTE Band 17 and LTE Band 4(AWS).

Q1. Is there firmware that will make this device support LTE band2 and LTE band 5?

Q2. Is there a SW to make VOLTE calls using the S3?

I am looking to unlock LTE band 2 and LTE band 5 on my ATT GS3.

Thanks in advance,