1. Modified by credit card App: Most banks have launched official credit card management App. Users can log in to the personal center, find the option to modify the reserved phone number, enter a new phone number, verify their identity information, and complete the modification.

2. Call the bank's customer service phone to modify: users can call the bank's customer service phone, verify their identity information through voice prompts or manual service, provide a new phone number, and complete the modification.