013 is not a country code. Numbers inside a country start like this: Pancevo (Serbia), Tilburg (Netherlands), Ana Dias - SP (Brazil), Diest (Belgium) and others. The first digit 0 is the trunk prefix for domestic calls and is dropped from abroad.
Have the full number? Check it in the number lookup.
| Area or operator | From abroad | Inside the country |
|---|---|---|
 Pancevo · Serbia | +381 13 … | 013 … |
 Tilburg · Netherlands | +31 13 … | 013 … |
 Ana Dias - SP · Brazil | +55 13 … | 013 … |
| Ariri - SP · Brazil | +55 13 … | 013 … |
| Barra do Braço - SP · Brazil | +55 13 … | 013 … |
| 29 more in Brazil | ||
 Diest · Belgium | +32 13 … | 013 … |
 qbmore/Cadcomms · Cambodia | +855 13 … | 013 … |
 Banha · Egypt | +20 13 … | 013 … |
 North Karelia · Finland | +358 13 … | 013 … |
 Gilan · Iran | +98 13 … | 013 … |
 Celcom · Malaysia | +60 13 … | 013 … |
 Dammam/Khobar/Dahran · Saudi Arabia | +966 13 … | 013 … |
 Bronkhorstspruit/Eastern Gauteng/Middelburg/Nelspruit/Northern and Western Mpumalanga/Witbank · South Africa | +27 13 … | 013 … |
| Vodacom · South Africa | +27 13 … | 013 … |
 Linköping · Sweden | +46 13 … | 013 … |
 Al-Zabadani · Syria | +963 13 … | 013 … |
 Victoria Falls · Zimbabwe | +263 13 … | 013 … |
If a number starts with +, the first 1–3 digits are the country code. If it starts with 0 (8 in Russia and Kazakhstan), it is a domestic number: an area or operator code follows, and from abroad the 0 or 8 is replaced with + and the country code. The same digits can mean different places, so where the call came from matters.