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Lookup a field to see whether or not it is null or has a value

Last Modified: 2017-11-03
Hi all.  

I currently have the following line of code to see if number entered is a valid one in my MasterCellDevices table:

            If DCount("connection", "MasterCellDevices", "[connection]='" & Me.txt_InvConnectionPhone & "'") > 0 Then

If it is a valid number I want to check to see if there is anything in the MasterCellDevices.ID field.  If there is, I want a msgbox to pop up saying that it is already assigned to a different location.  If it is null or empty I want it to update the field with the current ID.

I am struggling on how to figure out whether or not that field is empty or not.

Sorry if I didn't explain it enough, but I am new to coding and looking for help.

Thank you for your time and help.
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