<Tr> <Th> International call prefix </Th> <Td> 00 </Td> </Tr> <Tr> <Th> Trunk prefix </Th> <Td> 0 </Td> </Tr> <P> The Swiss telephone numbering plan implements the ITU - T recommendation E. 164 and is designated E. 164 / 2002, based on its last major revision in 2002 . It is a closed numbering plan, which means that all telephone numbers, including the area code, have a fixed number of digits . Swiss area codes are officially termed national destination codes (NDC). A complete telephone number consists of ten digits: 0xx xxx xx xx . Two formats are distinguished: three digits for the NDC and seven digits for the subscriber number, and four digits for the NDC and six digits for the subscriber number . However, a few exceptions exist . </P> <P> The associated dial plan requires that all numbers, even for local calls, must be dialed with the assigned NDC, in contrast to previous plans . When dialing from within the country, a prefix 0 must be dialed . </P>

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