> For the complete documentation index, see [llms.txt](https://create.cloud4wi.ai/dev-hub/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://create.cloud4wi.ai/dev-hub/wifi-sdk/integrating-the-sdk/android/sdk-methods/checkifcustomerexists.md).

# checkIfCustomerExists

### Search a Customer by customer properties

This method allows checking if a Customer with certain attributes (e.g. email or phone number) already exists in the Cloud4Wi account.

```objectivec
    /**
     * Check if customer with provided via CustomerQuery properties already exists
     *
     * @param query - <CustomerQuery> object with at least one field initialized
     * @param onSuccess - invoked if `customer exists` call was proceeded without exceptions
     * @param onError - invoked if exception occurred
     * @return future with boolean result of `customer exists` result
     */
    public Future<Boolean> checkIfCustomerExists(CustomerQuery query, Callback<Boolean> onSuccess, Callback<MobileSDKException> onError);

```


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