Managed Your Customer Database

My friend's mobile phone (lived in the USA) less than 1 year began to be rather fussy.
Because the guarantee still 1 year, he thought could get the free service improvement. Unfortunately he did not find this card of the mobile phone guarantee and only kept the number of the place shop he bought. When he telephoned the shop, they used the unique method (for me) to handle his case.

The shop or the Company, usually keeps the customer's data like the name, the address or the number of the series of the product. But the shop asked about the number of my telephone of the house of the friend's flat. After carrying out the verification of the data, and information showed that he was the customer and the guarantee still current, they are sued the letter to service and for the time being my friend was given the same kind mobile phone and just!!! All of them took place fast, without required to search again and to show the guarantee card that was lost.

My question is, why phone number?


The logic in fact is, possibly that customer's name could be the same in one city then. If the shop sell many similar products each month, the possibility happened the name of the same buyer really made sense. The number of the house telephone is certainly unique because of being registered.

On the other hand the possibility of losing the guarantee card was also very logical. To overcome this, that very important was this shop had goodwill to carry out his obligation, gave the guarantee, to the guarantee card that has become bore he replied.
Usually, if the guarantee card was lost, then purchase proof of the thing that became his foundation, that too did not yet guarantee the guarantee was valid. But, this shop really realize that the customer had the note that was bad in the matter kept purchase proof, etc. So as they had the idea of using the number of the customer's telephone, that his composition was unique, as the reference to keep database his customer. A method that could be made the example.

How with database in your shop or company?
Easy enough for you to find and accessed database without make customer busy?
And whether had you better method in handling your customer database than the method that was used by the shop?

Focus for Customer Satisfaction !!!