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M:

M2M
MCC
MDM
MIM
MMS
MNC
MNO
MNP
Mobile Advertising
Mobile Banking
Mobile Commerce
Mobile Content
Mobile Enterprise
Mobile Entertainment
Mobile Interaction
Mobile Messaging
Mobile Payment
Mobile Social Networking
Mobile Ticketing
MSC
MSISDN
MSRN
mTAN
MVNE
MVNO
 

mTAN
mTANs (Mobile Transaction Authentication Numbers) are SMS messages containing one-time passwords (OTPs) used by online banking services, enabling the user to authorize financial transactions. mTANs are a second layer of security above and beyond the traditional PIN authentication to access the online banking interface (2-factor authentication).