Meaning of Bulk SMS sender like TD, MD, AD, LM, DM

In our mobile, we get the sms with the code like DM-CBSSBI, TD-IDBIBK, AD-WEBSAM etc. Each code provide a meaning. First Letter from left means Operator code and the second letter means location code. From which location the operator organized the sms.

After hyphen ( – ) there is six characters called sender Id. Sender Id must be six character and can be chosen by user who use the sms gateway like bank, company.

AService ProviderRegion Code
BAirtelAndhra Pradesh
CDatacom SolutionsBihar
DAircel, Dishnet Wireless 
EReliance TelecomUP-East
G Gujarat
HHFCL InfotelHaryana
IIdea CellularHimachal Pradesh
J Jammu & Kashmir
K Kolkata
LBPL Mobile/Loop TelecomKerala
N North East
O Orissa
PSpice TelecomPunjab
RReliance CommunicationsRajasthan
SS telAssam
TTata TeleservicesTamil Nadu
WSwan TelecomWest Bengal
X Karnataka
YShyam TelecomMadhya Pradesh
Z Maharashtra