For the comma:
Delete both the comma and the space following the «city» field.
Select the «city» field and press Shift-F9. You should see { MERGEFIELD city }. Change this to { MERGEFIELD city \f ", "} and press F9 to update.

For the slash:
Delete the slash and the spaces either side of it.
Where the slash was, press Ctrl-F9 to create another field, which will look like { }
Insert another pair of «Home_TX» and «cell_TX» fields between the braces, thus:
{ «Home_TX» «cell_TX» }
Select the new «cell_TX» field and press Ctrl-F9 to create another field. You should now have:
«Home_TX»{ «Home_TX» {«cell_TX»} }«cell_TX»
Edit the fields you've created so you get {IF«Home_TX» <> "" {IF«cell_TX» <> "" " / "}}
Press F9 to update.

__________________
Cheers,
Paul Edstein
[Fmr MS MVP - Word]