Zero number lags while dialing

Hey there pulpul,

Thanks for clarifying. If you haven't already, you could see if restarting your iPhone 6 may help resolve this issue. Restarting can refresh the software and apps, so it can resolve unexpected issues. If needed, the steps below show how:

How to restart your iPhone 6, 7, 8, or SE (2nd or 3rd generation)

1. Press and hold the side button until the power-off slider appears.

2. Drag the slider, then wait 30 seconds for your device to turn off. If your device is frozen or unresponsive, force restart your device.

3. To turn your device back on, press and hold the side button until you see the Apple logo.

Those steps are from this article: Restart your iPhone

You'll also want to make sure your iPhone is up-to-date, as that can sometimes help resolve unexpected issues too. This article can walk you through how: Update your iPhone or iPad

If the issue continues after those steps, we recommend to work with Apple Support so that they can look further into this with you.

Take care.

Hello pulpul,

Thanks for reaching out to us for help. If you notice a performance issue with your iPhone you can try to resolve it by following the steps here: If your iPhone or iPad is running slow - Apple Support

If the issue continues, we recommend contacting Apple Support for more help: Get Support

Thanks.