010 is not a country code. Numbers inside a country start like this: Yerevan/Jrvezh (Armenia), Azercell (Azerbaijan), Beijing (China), Bangkok/Nonthaburi/Pathum Thani/Samut Prakan (Thailand) 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 |
|---|---|---|
 Yerevan/Jrvezh · Armenia | +374 10 … | 010 … |
 Azercell · Azerbaijan | +994 10 … | 010 … |
 Beijing · China | +86 10 … | 010 … |
 Bangkok/Nonthaburi/Pathum Thani/Samut Prakan · Thailand | +66 10 … | 010 … |
 Pirot · Serbia | +381 10 … | 010 … |
 Rotterdam · Netherlands | +31 10 … | 010 … |
 Wavre · Belgium | +32 10 … | 010 … |
 Smart · Cambodia | +855 10 … | 010 … |
 Vodafone · Egypt | +20 10 … | 010 … |
 Baraka · Malaysia | +60 10 … | 010 … |
| Celcom · Malaysia | +60 10 … | 010 … |
| DiGi · Malaysia | +60 10 … | 010 … |
| 4 more in Malaysia | ||
 Johannesburg · South Africa | +27 10 … | 010 … |
| Vodacom · South Africa | +27 10 … | 010 … |
 KT · South Korea | +82 10 … | 010 … |
| LG U+ · South Korea | +82 10 … | 010 … |
| SKTellink · South Korea | +82 10 … | 010 … |
 Sudatel · Sudan | +249 10 … | 010 … |
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.