on XT1528 i got the data like this.
I put the phone bptools
connected to pc
enabled usb debugging on phone
loaded moto diagnostic drivers in device manager for the last XT item of unknown devices.
OPEND the DFS and selected the port, given sent spc gone to programming, ip section changed simple ip to pref mobile ip
total profiles one and active profile one.
reset the phone and restarted the phone.
entered apn manually and saved
that's all, phone works with RGE sim data also
APN parameters name = any apn=net username=net password=net mcc is 404 and mNc is 00