You might struggle to find an Instagram support phone number on the app or website. However, there is a phone number provided on various websites including Pissed Consumer. Thus, when you search for the Instagram customer service phone number, you will be offered only this number: (650) 543-4800.
According to the company review #2850480, the phone number does not go through to a customer service representative. When you call the Instagram support number, it diverts to an automated voice system where you are directed to follow certain online instructions to resolve the issue. You can find similar instructions in the Instagram help center.