question: public static String networkNameToString ( byte [ ] data , int offset , int length ) { String ret ; if ( ( data [ offset ] & 0x80 ) != 0x80 || length < 1 ) { return "" ; } switch ( ( data [ offset ] > > > 4 ) & 0x7 ) { case 0 : int countSeptets ; int unusedBits = data [ offset ] & 7 ; countSeptets = ( ( ( length - 1 ) * 8 ) - unusedBits ) / 7 ; ret = GsmAlphabet . gsm7BitPackedToString ( data , offset + 1 , countSeptets ) ; break ; case 1 : try { ret = new String ( data , offset + 1 , length - 1 , "utf-16" ) ; } catch ( UnsupportedEncodingException ex ) { ret = "" ; Log . e ( LOG_TAG , "implausible UnsupportedEncodingException" , ex ) ; } break ; default : ret = "" ; break ; } if ( ( data [ offset ] & 0x40 ) != 0 ) { } return ret ; }
target:  Convert a TS 24.008 Section 10.5.3.5a Network Name field to a string "offset" points to "octet 3", the coding scheme byte empty string returned on decode error