If they were deleted off both the SIM card and phone memory you can't retrieve them.
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If you are on a contract SIM it will depend on the contents of your tariff. If you on pay as you go / pay as you talk it will cost you.
This can be done from the phones "Settings and Security" menu. Here, there is the option to bar calls from a specific number. To do this, however, one will need a password from their network provider.
Framework of 7Cs compass model are: 7Cs:(C1)Corporation, (C2)Commodity, (C3)Cost, (C4)Communication, (C5)Channel, (C6)Consumer, (C7)Circumstances. example of 7cs - Corporation means the competitor in the same area. e.g. in automobile there are many competitors such as BMW & Toyota etc. - Commodity means the product offered by the company. - Cost = price of the product . - Communication = promotions that offered by the company to communicates with its customers. - Channel:- means the place in 4Ps, e.g. where the company sells its products and to who, which group (government, citizen,companies etc.) - Consumer:- is the customer who buys that products ant it's the important element in the marketing story. - Circumstances:- Besides the customers, there are also various uncontrollable external environmental factors encircling the companies.