**EXHIBIT 12****CERTIFICATIONS**I, Carsten Schloter, certify that:1. I have reviewed this annual report on Form 20-F of Swisscom AG; 2. Based on my knowledge, this report does not contain any untrue statement of a material factor omit to state a material fact necessary to make the statements made, in light of thecircumstances under which such statements were made, not misleading with respect to the periodcovered by this report; 3. Based on my knowledge, the financial statements, and other financial information included inthis report, fairly present in all material respects the financial condition, results ofoperations and cash flows of the company as of, and for, the periods presented in this report; 4. The company’s other certifying officer(s) and I are responsible for establishing andmaintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and15d-15(e)) for the company and have: a) Designed such disclosure controls and procedures, or caused such disclosurecontrols and procedures to be designed under our supervision, to ensure that materialinformation relating to the company, including its consolidated subsidiaries, is madeknown to us by others within those entities, particularly during the period in whichthis report is being prepared;  b) Evaluated the effectiveness of the company’s disclosure controls andprocedures and presented in this report our conclusions about the effectiveness of thedisclosure controls and procedures, as of the end of the period covered by this reportbased on such evaluation; and  c) Disclosed in this report any change in the company’s internal control overfinancial reporting that occurred during the period covered by the annual report thathas materially affected, or is reasonably likely to materially affect, the company’sinternal control over financial reporting; and5. The company’s other certifying officer(s) and I have disclosed, based on our most recentevaluation of internal control over financial reporting, to the company’s auditors and theaudit committee of the company’s board of directors (or persons performing the equivalentfunction): a) All significant deficiencies and material weaknesses in the design oroperation of internal control over financial reporting which are reasonably likely toadversely affect the company’s ability to record, process, summarize and reportfinancial information; and  b) Any fraud, whether or not material, that involves management or otheremployees who have a significant role in the company’s internal control over financialreporting.        Date: April 21, 2006 /s/ Carsten Schloter   Carsten Schloter   Chief Executive Officer  
 

 
     I, Mario Rossi, certify that:1. I have reviewed this annual report on Form 20-F of Swisscom AG; 2. Based on my knowledge, this report does not contain any untrue statement of a material factor omit to state a material fact necessary to make the statements made, in light of thecircumstances under which such statements were made, not misleading with respect to the periodcovered by this report; 3. Based on my knowledge, the financial statements, and other financial information included inthis report, fairly present in all material respects the financial condition, results ofoperations and cash flows of the company as of, and for, the periods presented in this report; 4. The company’s other certifying officer(s) and I are responsible for establishing andmaintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and15d-15(e)) for the company and have: a) Designed such disclosure controls and procedures, or caused such disclosurecontrols and procedures to be designed under our supervision, to ensure that materialinformation relating to the company, including its consolidated subsidiaries, is madeknown to us by others within those entities, particularly during the period in whichthis report is being prepared;  b) Evaluated the effectiveness of the company’s disclosure controls andprocedures and presented in this report our conclusions about the effectiveness of thedisclosure controls and procedures, as of the end of the period covered by this reportbased on such evaluation; and  c) Disclosed in this report any change in the company’s internal control overfinancial reporting that occurred during the period covered by the annual report thathas materially affected, or is reasonably likely to materially affect, the company’sinternal control over financial reporting; and5. The company’s other certifying officer(s) and I have disclosed, based on our most recentevaluation of internal control over financial reporting, to the company’s auditors and theaudit committee of the company’s board of directors (or persons performing the equivalentfunction): c) All significant deficiencies and material weaknesses in the design oroperation of internal control over financial reporting which are reasonably likely toadversely affect the company’s ability to record, process, summarize and reportfinancial information; and  a) Any fraud, whether or not material, that involves management or otheremployees who have a significant role in the company’s internal control over financialreporting.        Date: April 21, 2006 /s/ Mario Rossi   Mario Rossi   Chief Financial Officer