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Why is the Contact List Navigation Bar Failed?

In the contact list, click the specified letter to navigate, such as "z." After you open it, you will find "y." Check whether there are few contacts in the contact list of your mobile phone. The software implements this function when the contacts corresponding to the selected letters are displayed less than one screen. The letters selected by you are the letters at the bottom but when you release your hand, the focus will automatically focus on the letters at the top of this screen. This is a normal symptom.

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