[De4dpOol]

pawn Code:

CMD:checkphone(playerid, params[])
{
    new id,string[128],name[MAX_PLAYER_NAME];
    if(sscanf(params, "u",id)) return SendClientMessage(playerid, -1,"USE /checkphone [ID/Player name]");
    for(new i = 0; i < MAX_PLAYERS; i++)
    {
        GetPlayerName(i, name, sizeof(name));
        if(strfind(name, id, true) != -1)
        {
            format(string,sizeof(string),"Number: | %d | User: | %s |",YourPhoneNumVariable, name);
            SendClientMessage(playerid,-1,string); 
        }
    }    
    return 1;
}

Untested code, but it should work. Not sure.. please fix my code if anyone see any mistake.