How can i change the trusted phone number for my i tunes apple store

Hey mirtha64,

It sounds like you're using Two-factor authentication, and need assistance with managing your trusted phone numbers. We understand keeping this information up-to-date is a high priority for access to your content. You've come to the right place for answers.

Here's a resource that goes over this information in detail, specifically the section "Manage your account" -

Two-factor authentication for Apple ID - Apple Support

Take care!