I too have USC moto X on 4.4.2 in which I am using old Reliance cdma sim cut into nano with prepaid connection and data working fine .tried with postapiad old sim cut into nano and data not working with postpaid,but data is active on my postpaid connection as if I put same sim into lenovo handset data works fine .
Tried with postpaid connection on new micro sim cut into nano bit still no go for data with it as well ...so at the moment at a working for me is only with one prepaid no. That's all .
Any soluting guys ???