Because of wireless service costs plummeting in the last year, and as mobile phones are increasingly common, many people now using their mobile phones to make calls across a wide region at night and on weekends, when numerous wireless companies provide unlimited airtime for a relatively small monthly fee.

• ABecause of wireless service costs plummeting in the last year, and as mobile phones are increasingly common, many people  
• BAs the cost of wireless service plummeted in the last year and as mobile phones became increasingly common, many people  
• CIn the last year, with the cost of wireless service plummeting, and mobile phones have become increasingly common, there are many people  
• DWith the cost of wireless service plummeting in the last year and mobile phones becoming increasingly common, many people are  
• EWhile the cost of wireless service has plummeted in the last year and mobile phones are increasingly common, many people are