The Swiss Compensation Office in Geneva is responsible for paying pensions to persons residing abroad. If you move abroad, any entitlement to the disablement allowance and supplementary benefits lapses.

Persons who come from countries with which Switzerland has not concluded a social security agreement lose their pension entitlement if they move abroad. However, you can request a refund of OASI contributions (Claim for refund of OASI contributions).

More useful information is available here:

Leaflet 10.02 - The voluntary old-age, survivors' and disability insurance scheme (pages 23-29)
Leaflet 10.03- Citizens of States with which Switzerland has not concluded an Agreement on Social Security (pages 41 to 52).