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Is Swisscom able to guarantee the reception of the SMS in its service level agreement (SLA)?

Reception of SMS with terms of use or one-time code for signature approval method password and SMS code (PWD/OTP)

Swisscom is not able to sufficiently guarantee the reception of the SMSs. The only factor Swisscom is responsible for is sending out the SMS as quickly as possible. We can neither control the reception conditions of the mobile signal nor the performance of the internal or external roaming partner because it is based on international telecom contracts and standards.