66 of travel. Original documents (not photocopies or scans) of the claims, boarding passes, receipts, etc. proving travel and length of stay are required for audit purposes. Accordingly, without complete supporting documentation, the claim will not be processed. No further travel advances will be paid to a traveller who has failed to submit the necessary completed claim for a prior travel. 25. Travel claims are reviewed by OHCHR but settled by UNOG. Due to the heavy workload of UNOG Finance, during peak periods the claims may take several months to settle. E. Mobile phones 26. OHCHR does not provide telephones (either landline or mobile) to non-staff of the United Nations. Calls of an official nature to OHCHR or, for example, government officials in the country a mandate holder is visiting may be made by the mandate holder using an OHCHR telephone assigned to an accompanying staff member but calls relating to matters outside the mandate, such as to a mandate holder’s family or place of work would need to be reimbursed to the Organization. OHCHR practice is to confine the use of the mobile phone to staff members who must account for its use and pay for any unofficial calls. F. Provisions for persons with disabilities 27. In line with the Organization’s commitment to continuing to improve accessibility and full inclusion of persons with disabilities (as reflected in General Assembly resolutions 65/186, para. 15 (d), and 68/268 among others), the United Nations has in place arrangements aimed at the progressive implementation of standards and guidelines for the accessibility of facilities and services of the United Nations system by experts with disabilities. 28. The United Nations also has in place arrangements to provide reasonable accommodation for an expert with disabilities. Reasonable accommodation may include the adjustment of a practice, condition or requirement to take into account the specific needs of the expert with a disability, to enable her/him to fully discharge her/his official functions. Such reasonable accommodation must be made within existing resources or with any additional resources approved for this purpose by the General Assembly. G. Schengen visa for Switzerland 29. Given that Switzerland is a party to the Schengen Agreement, this has implications for those requiring a visa for Switzerland. As the documentation required for obtaining a Schengen visa may vary from one country to another,