[DJDhan]

Код:

stock GetPlayerNumber(numero)
{    
     for(new i = 0; i <= GetMaxPlayers(); i++)    
     {        
              if(PlayerInfo[i][CellNumber] == numero) return i;   // Playerinfo[i][Cellnumber]  is where you store the cell number of each player
     }    
     return INVALID_PLAYER_ID;
}

Code8976man is right. Try the above code.

Also, it's more efficient to use GetMaxPlayers instead of looping 500 times when the maximum your server allows is, say 100.