Fix for bug when joining where ID prefixes would be added even if they use the default ID namespace
BEGIN:VCARD
VERSION:2.1
N:Bloggs;Joe;;;
ORG;CHARSET=UTF-8:Symbian Software Ltd;
TEL;HOME;VOICE;CELL:447891234567
EMAIL;INTERNET;ENCODING=QUOTED-PRINTABLE:joe.bloggs@home.com
TITLE:Engineer
TEL;WORK;VOICE:441234567890
TEL;PAGER;WORK:441234567892
EMAIL;INTERNET;WORK;ENCODING=QUOTED-PRINTABLE:joe.bloggs@symbian.com
URL;WORK:www.symbian.com
ADR;WORK: 2 Boundary Row;London;Greater London;SE1 8HP;UK;;
X-SPEEDDIAL:5:tel:work:voice
END:VCARD