For Sprint S6, and s6 edge I got success by using the files i posted above. GSM is working fine except receiving Bank SMS. CDMA oMH working fine. Tested, Reliance Recrucxxxx, Docomo CDMA, BSNL CDMA. I do not have access to MTS.
Here is the link containing GLOBAL(international+domestic) apn database (Of 1,346 MAJOR GLOBAL GSM PROVIDERS)
with Galaxy Tools you can use it by placing this file after root put in the root directory of their internal storage and use Galaxy Tools
(UNDO/Restore button) to add these to their phone(reboot after clicking UNDO/Restore)
https://www.dropbox.com/s/fbml7b3qm7me228/telephony.db.bk?dl=0
Can you please explain step here in easy format.i refer xda but confused there
just root handset and do this command after u can see ##3424# diag is enabal and u can read spc via dfs and cdma tool dear