There has been a lot said about already about the Samsung Galaxy S3 on T-Mobile, for one it costs more. There is now another reason to think twice about going with the carrier for the phone and that is that it will not have compatibility for LTE.
T-Mobile Samsung Galaxy S3 costs more and give you less
A spokesman for the carrier confirmed that the pricier phone would not ride with the upcoming LTE network of T-Mobile in the future. He went on to say that they would continue operating their HSPA+ 42 network when LTE was launched in 2013.
It seems that the AWS Spectrum is to blame as this would carry the LTE network of T-Mobile. Other carriers rely on the 700 MHz spectrum for LTE. If T-Mobile wanted to offer support to their un-launched LTE network it would mean that they would have to add more bands to the LTE radio.
Samsung have said that their handset is the same across carriers and the phones have been optimized to work on the specific network of the carrier. T-Mobile on the other hand says that the Samsung Galaxy S3 has a different chipset than their competitors. Apparently theirs is the MSM8260 which has no support for LTE but does support HSPA.
Currently AT&T offers the Samsung Galaxy S3 for $199.99 for the 16GB which gives you savings of $30 to $80 and then there is the monthly data plan to add on. However with AT&T you would be able to use it on their LTE connection. The same can be said about Verizon as well.