The calls, detected on Saturday, had been seen as hope that the 44 crew aboard the A.R.A. San Juan were alive.
Authorities last had contact with the ARA San Juan on Wednesday as it sailed up Argentina's south coast towards Mar del Plata.
Waves up to 20-feet in the area where the sub went missing, about 260 miles from the Argentine coast, were complicating the global search effort, Adm. Gabriel Gonzalez, commander of the base, was quoted by The Associated Press as saying.
"We have received the report of the company, which has analyzed the signal, the seven call attempts for Saturday does not correspond to the satellite phone of the submarine", said the spokesman of the argentine Navy, Enrique Balbi.
It was on a 10-day voyage from Argentina's southernmost port, Ushuaia, to the naval base at Mar del Plata, 250 miles (400km) south of Buenos Aires.
During that final communication, the vessel had reported a mechanical breakdown.
The submarine disappeared 430km (267 miles) off the Argentine coast on Wednesday and no traces of it have been located.
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The Argentine Navy has said that they do not believe the malfunction was the reason the submarine has been missing.
Under normal circumstances, the vessel has sufficient fuel, water, oil and oxygen to operate for 90 days without external help, Balbi said, and the vessel could "snorkel" - or raise a tube to the surface - "to charge batteries and draw fresh air for the crew".
At the Vatican, Argentine-born Pope Francis said he offered "his fervent prayer" for the safety of the submariners. On Board the submarine at the moment of departure was 44 members of the crew, why the ship did not respond and that could happen - is not known.
"We do not have clear evidence that (the calls) have come from that unit", Gonzalez said. "It was therefore asked to change course and go to Mar del Plata".
"Besides just the faith one has to maintain in these situations, I truly trust that they are going to find them", Silvina said. Built in Germany, it underwent maintenance in 2008 in Argentina. The submarine also has an emergency position-indicating radio beacon (EPIRB) and a satellite communications buoy that can be deployed if the vessel is in distress.
In addition to the UUVs, the US has deployed aircraft to assist in the search, as well as underwater equipment specifically designed for submarine search and rescue.
The Argentine military has also been working with a United States company that specializes in satellite communication to determine the location of the submarine. Officials have said the crew should have an ample supply of food and oxygen.