Author: Ingolf Rauh

Hints to the reception of SMS and One-Time-Passwords

Due to individual support enquiries regarding the receipt of certain SMS messages, the problem of using SMS, especially for signature applications abroad, should be addressed again. (Many of the points were already addressed in the partner webinar on November 17th, 2021).

SMS delivery in Germany, Austria, Liechtenstein and Switzerland works quite well, the delivery success rate is usually >95%. Even in other European countries, e.g. France, there are stricter rules for SMS receipt, filtering, restrictions on the sending time or non-acceptance of SMS with alphanumeric senders or vice versa. Various countries require prior notification of the transmitted texts. Newer and newer cheap providers with virtual networks are appearing on the market, but have an inadequate contract situation in the roaming environment. Internationally, the success rate is 85%-90% of delivered SMS minus personal reception problems due to poor mobile reception, lack of SMS support for WLAN calls, multi-SIM card operation, etc. in the smartphone. We therefore do not guarantee the receipt of an SMS in our service promise and therefore ask you to refrain from enquiries about reasons for non-delivery of individual mobile numbers.

Now that the EU Commission will prevent OTP via SMS access for EU login from May, we assume that OTP via SMS will also have an uncertain future as a second factor in the signature environment in terms of regulation and legislation.

With the Multiple Authentication Broker, alternative signature approval methods are available, and one-time signatures can now also be sent without a final SMS. Passkey in particular is a method that is natively available on every device and trumps OTP/SMS in terms of user-friendliness due to its reliability and is also a 2-factor method. We therefore strongly recommend - especially in the international environment outside the DACH countries - the use of alternative authentication to an OTP via SMS procedure.

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