Microsoft Lumia 550

1. Find "Phone"

Slide your finger downwards starting from the top of the screen.

1. Find "Phone"

Press All settings.

1. Find "Phone"

Press System.

1. Find "Phone"

Press Phone.

2. Save voicemail number

Press the indicator below "Use default voicemail number" to turn off the function.

2. Save voicemail number

Press New voicemail number and key in +447836121121.

3. Return to the home screen

Press the Home key to return to the home screen.