Why am I failing to update my apps
my phone is declining my billing details as a result I can’t update my apps
iPhone 11, iOS 15
The support article you came here from should provide you with the steps needed to try to resolve this issue. Have you tried them all yet? If so, and they didn't help, I suggest that you contact Apple Support directly. To do so, simply select the "Get Support" link in the upper right-hand side of this forum's web page.