 Other administrators working under GSMA may also allocate any IMEI for use in dual-technology phones.Every IMEI can also be used as an MEID in CDMA2000 devices (as well as in single-mode devices designed with GSM or other 3GPP protocols) but MEID codes may also contain hexadecimal digits and this class of MEID codes cannot be used as an IMEI.There are two standard formats for MEIDs, and both can include an optional check-digit.