Help me please to find a firm in Helsinki, which attends to trade, repair of cellular telephones MNT, GSM, tried to take advantage of your retrieval system,…

If I understood your question right, you need information on where to buy and repair mobile phones. You can try e.g. http://www.makitorppa.fi or http://www.nokia.fi/matkapuhelimet/jalleenmyyjat_2.html. These www-sites have information about cellular phone stores and repair in Helsinki. Hopefully they can help you with your request.