The ITU lists both Russia and Kazakhstan under +7. Do not assign one country from +7 alone.
Read past the first digit
The later digits belong to national allocations that distinguish the relevant plan or range.
Check an authoritative plan
Use the ITU entry and responsible national authority before labeling a specific range.
Do not infer a person
The code does not establish residence, citizenship, current carrier or location.
Do not choose a country from +7 alone
Russia and Kazakhstan share +7. A partial prefix gives less information than a complete number interpreted against a current national plan.
+7 only
Safe result: Shared calling code
Next step: Keep both plan participants visible
More national digits
Safe result: Potential national allocation context
Next step: Check the corresponding current plan
A complete number
Safe result: Format/range can be interpreted with metadata
Next step: Do not infer nationality or live position
This prototype does not maintain a complete +7 range table. It will not guess the national allocation from arbitrary following digits.