0728 is not a country code. Numbers inside a country start like this: Xiantao, Hubei (China), Liwa (Indonesia), Talkio (Uganda). 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 |
|---|---|---|
 Xiantao, Hubei · China | +86 728 … | 0728 … |
| Xiantao/Qianjiang/Tianmen, Hubei · China | +86 728 … | 0728 … |
 Liwa · Indonesia | +62 728 … | 0728 … |
 Talkio · Uganda | +256 728 … | 0728 … |
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.