Saint Helena:

Saint Helena has the international calling code +290 which, since 2006, Tristan da Cunha shares. Saint Helena telephone numbers changed from 4 to 5 digits on 1 October 2013 by being prefixed with the digit "2", i.e. 2xxxx, with the range 5xxxx being reserved for mobile numbering, and 8xxx being used for Tristan da Cunha numbers (these still shown as 4 digits).

Please answer a question about this article. If the question is unanswerable, say "unanswerable". When did Saint Helena change the amount of digits in their phone numbers?
1 October 2013