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As the cost of wireless service has steadily dropped over the last year and as mobile phones have become increasingly common, many people are finding that they can avoid toll charges on their home phones, using their mobile phones for making long-distance calls at night or on weekends, at a time which many wireless companies provide unlimited airtime for a small monthly fee.
(A) phones, using their mobile phones for making long-distance calls at night or on weekends, at a time which
(B) phones, instead using mobile phones to make long-distance calls during the night of weekends, during which
(C) phones by using their mobile phones to make long-distance calls at night or on weekends, when
(D) phones using mobile phones for making long-distance calls during the night or weekends, when
(E) phones when using their mobile phones to make long-distance calls at night or on weekends, a time which.
(A) phones, using their mobile phones for making long-distance calls at night or on weekends, at a time which
(B) phones, instead using mobile phones to make long-distance calls during the night of weekends, during which
(C) phones by using their mobile phones to make long-distance calls at night or on weekends, when
(D) phones using mobile phones for making long-distance calls during the night or weekends, when
(E) phones when using their mobile phones to make long-distance calls at night or on weekends, a time which.
