U.S. Senator Al Franken has written a letter the Federal Communications Commission (FCC) and Department of Justice (DOJ) to urge the rejection of the proposed AT&T acquisition of T-Mobile.

Franken said the deal would be bad for customers and potentially raise the cost of wireless service by as much as 25 percent, citing industry analysts.

He also cited job loss and the stifling of innovation as potential negatives of the merger.

In his letter, Franken pointed out that "Ma Bell's" government-sanctioned monopoly for 70 years came at a great cost to U.S. customers, who were charged exorbitant fees for long distance calls.

The DOJ finally broke it up in 1984 into seven separate companies. However, AT&T has now managed to acquire four of the seven divested companies, according to Franken.

If it were allowed to acquire T-Mobile, it would dominate the wireless market with just one other large competitor (Verizon).

Franken also said if the DOJ rejected the Sprint and WorldCom merger because it concentrated 80 percent of the long distance telephone service market to three companies, it should rejected the AT&T and T-Mobile deal, which concentrates 82 percent of the wireless market into two companies.

Below is the full text of Franken's letter to the FCC.