Holy s* !!! I did it !!! I just can't believe that it works, but i did it !!! Now i've got two fully functional N900 .
Thanks all !!! I bought a suposelly broken N900 with that "all telephony functions disable" s*, just to take off the LCD from it and put on my broken N900. Long story short, the problem wasn't on LCD and i just change the ribbon and my N900 was born again !!! Plus, i managed to fix that "telephone functions" on the other N900 with the pen's spring approach and guess what ? It works like a charm !!! I don't remember now the name of the "spring fix" author but i'll will search just to thank him. Long life to the N900 !!!
And just for record, my ribbon came with the glue, so i think i just misunderstood the seller.