AskKaka lists the STD code of Allagadda that is 08519. Allagadda is a part of Andhra Pradesh and the ISO code of Andhra Pradesh state is AP.
Allagadda STD code aka subscriber trunk dialing code is 08519 which is mentioned above on this page of AskKaka. We are great resource of finding Allagadda std code of Andhra Pradesh (AP).
Useful Info :-
Please take a note that if you are in India and dialing a landline number of Allagadda then you will have to dial STD code 08519 as a prefix followed by the phone number of a landline user and if you are calling Allagadda's phone number from a foreign country then you need to add +91 (the country code) followed by 8519, e.g. +918519 (no need to add "0" as prefix) followed by the landline phone number.
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