One Use Per ACCOUNT Codes
CGJH-WFMC-XLBF - Letter "H"
RXZB-XVCB-GGHJ - Letter "I"
PFLD-WMXK-CMVZ - Letter "O"
FQDT-PMWZ-SBLJ - Letter "L"
KXZT-GVLH-XVSB - Letter "O"
One Use per DAY Codes
DFMF-BBPB-QZMF - Either the letter "R", "O", "U" or "L"
Any others?
Some that you didn't mention over here:
http://wiki.answers.com/Q/What_are_some_subway_scrabble_cheats
Multiple use, Multiple people (once per day - MAX 4 times):
DFMF-BBPB-QZMF - Randomly Letters L, O, R, or U
Single use, Multiple people:
QLHK-JGQJ-GMHC – Letter "D"
QCDM-QLDK-TRNG – Letter “H”
CGJH-WFMC-XLBF – Letter “H”
XLSS-NGJC-JRDJ – Letter “I”
RXZB-XVCB-GGHJ – Letter “I”
FQDT-PMWZ-SBLJ – Letter “L”
PFLD-WMXK-CMVZ – Letter “O”
KXZT-GVLH-XVSB – Letter “O”
NSMR-SLDZ-SVKX - Letter "O" - Added Aug 31
SRTR-KVRW-ZWWG - Letter "R"
Sept 2
JNSH-QFXR-KGCW – Letter "D"
HJGG-VGPM-FPPG - Letter "U"