ASN Bank has told customers that its implementation of iDEAL Wero does not currently support every phone and operating system, after GrapheneOS users reported being unable to activate or use the payment service. The response makes the issue more specific than a general failure of the bank's Android application: complaints collected in a public compatibility tracker focus on the security checks used during iDEAL Wero activation and payment.
The tracker includes text presented as ASN Bank's formal response to a customer using GrapheneOS on a Pixel 9. According to that response, the app rejected the device because it did not meet the service's security requirements. The customer had asked the bank to accept a less restrictive integrity check or investigate direct hardware attestation rather than relying on certification associated with Google's Play Integrity system.
ASN said online payments through the new iDEAL Wero service are subject to European privacy, security and fraud-prevention rules. It said iDEAL Wero uses standard security controls for conventional operating systems and cannot guarantee transaction security when alternative systems replace or bypass those controls. The bank also said it follows shared requirements established by the parties involved in joint payment initiatives.
That explanation does not establish that GrapheneOS itself is insecure. It describes the compatibility and assurance policy applied by the payment service. GrapheneOS is an Android-based operating system that emphasizes security and privacy, but it is not certified by Google in the same way as the stock software installed on many consumer phones. The dispute therefore centers on which attestation signals a financial application will accept, not simply whether the handset can run the app.
Reports in the tracker have varied over time. Some users said the general ASN banking app worked without Google Play services, while others described login or payment limitations. Participants also distinguished the main banking application from mobile-payment functions. The recent complaint text specifically concerns iDEAL Wero, helping explain why earlier reports about ordinary banking features do not necessarily contradict the newer restriction.
ASN said it was examining possible support for alternative operating systems with iDEAL Wero, but that the outcome depends on several parties and technical developments. It gave no commitment or schedule and said it had no workaround that would let the affected customer use the payment feature on that phone.
The available evidence comes from a community issue containing user reports and reproduced complaint responses, rather than a standalone public advisory from the bank. The precise reach of the restriction across devices and app versions therefore remains uncertain.
