{TAIL ~ This request} may be originated by the user, by the system operator, or by {HEAD ~ the subscriber identity module} 
{ TAIL ~ This request } may be originated by the user , by the system operator , or by { HEAD ~ the subscriber identity module }
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD