Work fine on my K800@K810 CID52 with CID53 software.Code:;K810 SW-R8BF003 ;Possibility to store more SMS (was 1000) ;(c) demion ;(p) Adow ;(p) MouSeX ;(p) Stonos ;452525E6: FA229200 7D221201; 2000 SMS ;452525E6: FA229200 FA221201; 4000 SMS 452525E6: FA229200 9D229201; 10000 SMS