During the night of June 7th from 11pm-5.30 am as well as on June 8th from 11pm-5.30 am, maintenance work will be carried out on the Swiss SMS system, which also sends SMS for Swisscom Trust Services to all mobile customers except those with a German mobile number. As all components are redundant, there should be no restrictions in operation at any time. Nevertheless, experience shows that an SMS can sometimes be lost in a switchover moment.