It depends with many I use all forms at some point phone I find is best to explain something envolved though

Is there an echo in the room or did you ask this question .... twice?

Tricky Will Hamm  changing the font to see if we chage our answers 

In the manner that they prefer.

All of the above. Text for short reminders or check-ins. Email for longer written communication. Phone for issues that are complicated. Then there's Facebook messaging...

I generally use what is most convenient for them but prefer a phone most of the time

Depends on their preference.

Email or phone call is the majority.  Text on rare instances.  Depends on the preference of the client.

Phone followed with email

Use their preferred ways.

Will Hamm - even if you ask twice.,,, it depends...

I communicate with the clients however they want me to!

All of the ways you mentioned. 

Double entry question :-) Already answered on the other...

Combo ... all of the above. 

It depends

All of the above. Depends on the issue, the client, the time frame.