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A 'mobile signature' is a digital signature generated either on a mobile phone or on a sim card.
'Origins of the term'
The term first appeared in articles introducing mSign (short for Mobile Electronic Signature Consortium). It was founded in 1999 and comprised 35 member companies. In Oct. 2000, the consortium published an XMl-interface defining a protocol allowing service providers to obtain a mobile (digital) signature from a mobile phone subscriber.
In 2001, mSign gained industry-wide coverage when it came apparent that Brokat (one of the founders company) also obtained a process patent in Germany for using the mobile phone to generate digital signatures.
The term was then used by Paul Gibson (G&D) and Romary Dupuis (France Telecom) in their standarisation work at the European Telecommunications Standards Institute (ETSI) and published in ETSI Technical Report TR 102 203.
'Mobile signatures today'
Currently, GSM
phones and WAP phones are mostly supporting this technology. Those mobile signature services on sim cards can be supported by almost all GSM phones, regardless of their capacity. In the near future, 3 G-phones and other portable devices will feature a similar mobile signature application.
The mobile signature is the legal equivalent of your own wet signature. The mobile signature
is created by typing a secret code (i.e. your signing PIN) into the signing device (for
example: your mobile phone). This secret code in combination with your key storage
token (for example: SIM card) and a chosen text triggers a cryptographic algorithm to
generate the (digital) signature.
Each of your mobile/digital signatures can be linked to a digital certificate (an electronic record) that vouches for your real-world identity.
Thus, the mobile signature is a unique feature for:

★ Proving your real-world identity to third parties without face-to-face communications

★ Making a legally-binding commitment by sending a confirmed message to another party

★ Solve security problems of the online world with identity confirmation.
'Qualified Mobile Signature Service providers in the world:'

★ Elisa / Finland http://www.elisa.fi

★ TeliaSonera / Finland http://www.teliasonera.fi

★ Turkcell / Turkey http://www.turkcell.com.tr

★ Mobitel with Halcom-CA / Slovenia http://www.mobitel.si, http://www.halcom-ca.si
'Companies offering Mobile Signature Service infrastructure in the world:'

★ Valimo / Finland http://www.valimo.com

★ SmartTrust / Sweden http://www.smarttrust.com
'Mobile Signature with On Board Key Generation'
Turkcell is the first provider of a mobile signature service with "On Board Key Generation" functionality, which enables customers to create their signing and validation key pair, after they get the simcard. In this way GSM operators does not need to distribute signing PINs to customers. Customers can create their PIN anew, on their own.

★ http://www.turkcell.com.tr/index/0,1028,400004,00.html?banner=dig_20022007_turkcellmobilimza (In Turkish)
Mobile Signature