[NTG-context] Mobilephone Symbol

Hello Everyone, The following minimum example only produces the symbols for Neptune and Letter. Mobilephone and phone don't work. Am I doing something wrong? ----------- %\usesymbols[symb-imp-mvs] \usesymbols[mvs] \starttext %\showsymbolset \symbol[martinvogel 2][Mobilephone] \symbol[martinvogel 2][Letter] \symbol[martinvogel 2][Phone] \symbol[astronomic][Neptune] \stoptext ----------- Many thanks for any suggestions. -- Devendra Ghate