Hold 1 for voicemail by default

[cy1der]

Checklist

• I made sure that there are no existing issues - open or closed - to which I could contribute my information.
• I made sure that there are no existing discussions - open or closed - to which I could contribute my information.
• I have read the FAQs inside the app (Menu -> About -> FAQs) and my problem isn't listed.
• I have taken the time to fill in all the required details. I understand that the request will be dismissed otherwise.
• This issue contains only one feature request.
• I have read and understood the contribution guidelines.

Feature description

Enter voicemail when you press and hold the "1" key on the numpad.

Why do you want this feature?

Mostly for convenience, it would be nice to be able to quickly enter voicemail instead of searching for the carrier's voicemail number and enter it manually. Also, plenty of other phone apps support this (Welefon, Google Phone, etc).

Additional information

No response

[Aga-C]

You can already configure it manually in Settings → Manage speed dial, where you can assign any number under any keyboard digit.

We won't do it automatically because:

• If we'd enforce speed dial of voicemail under 1, we will break current speed dial user configs. 
• As Fossify Phone doesn't have an Internet access, we would need to keep a database of all possible voicemail numbers for all carriers around the world.