ELM327 won't connect to Iphone

ELM327 won’t connect to Iphone via bluetooth.
No instructions came with the sensor. No passcode.
How can I make this connect?

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What adapter do you have exactly? Even though the Nonda adapter might use the ELM327 chip, this is not a general support forum for problems with any ELM327 chip based bluetooth OBD adapter…

I am having the same problem. Its not connecting with my iPhone. With the Android I can use it but i have iphone