The acquisition of AT&T by SBC and the purchase of MCI by Verizon will eliminate two choices for residential telephone service but may...

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NEW YORK — The acquisition of AT&T by SBC and the purchase of MCI by Verizon will eliminate two choices for residential telephone service but may not have a major impact on consumers.

AT&T and MCI halted their efforts to sign on new customers for traditional phone services last year after losing some regulatory battles, so their influence on price competition has already declined dramatically.

Instead, two rival modes of placing calls have been keeping pressure on traditional phone companies to hold down prices: cellphones and the Internet-based phone services being introduced by all the major cable-TV companies, independent players such as Vonage, and even AT&T.

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Estimates vary, but millions of Americans use their cellular handsets as their primary or only phone service.

In addition, tens of millions more of the nation’s 175 million wireless subscribers use their mobile phones for long distance because they have national calling plans with unlimited off-peak minutes.

Internet-based phone service, often called “VoIP” for voice over Internet protocol, hit the mainstream over the past year with the introduction of service from AT&T, top cable companies and small upstarts.

VoIP service requires a high-speed connection to the Internet such as DSL service from a phone company or broadband from a cable provider.

The technology converts the conversation into packets of data similar to any other type of online traffic, then reassembles it into sound at the receiving end.

For those who prefer the old-fashioned way of making a call, traditional local and long-distance service is expected to remain available for years to come through the regional Bell companies — Verizon, SBC, BellSouth and Qwest.

SBC and Verizon haven’t said what will become of the AT&T and MCI brands, which had a combined 38 million consumer customers at the end of 2004, primarily in long distance. But since all four local Bells also sell long distance, those customers won’t suddenly find themselves cut off with no provider.