AskKaka lists the STD code of Chinnor that is 08737. Chinnor is a part of Andhra Pradesh and the ISO code of Andhra Pradesh state is AP.
Chinnor STD code aka subscriber trunk dialing code is 08737 which is mentioned above on this page of AskKaka. We are great resource of finding Chinnor std code of Andhra Pradesh (AP).
Useful Info :-
Please take a note that if you are in India and dialing a landline number of Chinnor then you will have to dial STD code 08737 as a prefix followed by the phone number of a landline user and if you are calling Chinnor's phone number from a foreign country then you need to add +91 (the country code) followed by 8737, e.g. +918737 (no need to add "0" as prefix) followed by the landline phone number.
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