The phone systems maintains the phone directory, through which we can store all the details of the phone needed by the customers,while they are using the phone systems including both the land line and mobile phone numbers. When comparing with the land line phones, the mobile phones are considered to be the best one as we can carry out the phone within us as we can’t took the land line phones with us where we are moving.Also the Call Recording offers several other services, which are not offered by the land lines.As, they are offering several services most of the people are now a days using cell phones.

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