Sprint plans to push forward with a bid for Bellevue-based T-Mobile US after meeting with banks last month to make debt arrangements for that offer, people with knowledge of the situation said.

Sprint Chief Financial Officer Joe Euteneuer and Treasurer Greg Block met with six banks to ensure the lenders would be ready with financing structures when Sprint decides to pursue a takeover, said three of the people, asking not to named because the discussions are private.

Masayoshi Son, chief executive officer of SoftBank, which owns about 80 percent of Sprint, is expected to make a formal bid in June or July, one of the people said. While regulators have consistently expressed concerns about a combination of the third- and fourth-largest wireless carriers in the U.S., Son and his advisers are building an argument they hope will convince the Federal Communications Commission (FCC) and the Department of Justice about the long-term health of the U.S. wireless industry.

“Son doesn’t give up,” said Tomoaki Kawasaki, an analyst at Iwai Cosmo Holdings in Tokyo. “An acquisition of T-Mobile would increase Sprint’s ability to compete in the U.S. by expanding scale and reducing costs.”

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Shares of T-Mobile rose as much as 11 percent in after-hours trading Wednesday. They closed the regular trading session at $29.29, giving the company a market value of almost $24 billion. Sprint rose 6 percent in after-hours trading, after closing at $8.50.

The talks with banks centered on how much Sprint should borrow for the deal, a move that would have it also take on the $8.7 billion in net debt that T-Mobile has amassed, the people said. No financing commitments have been signed, and Son is still debating how to pay for a deal, the people said.

SoftBank and Deutsche Telekom, which owns about 67 percent of T-Mobile, are still speaking with each other to determine who would run the company, the people said. T-Mobile CEO John Legere is the leading candidate, one of the people said. Deutsche Telekom wants as much cash as possible in the deal, another person said.

Representatives for Sprint and T-Mobile declined to comment. A spokesman for Deutsche Telekom didn’t respond to an email seeking comment sent outside regular business hours.

Sprint wants to pursue a deal while the Justice Department and FCC are also reviewing Comcast’s acquisition of Time Warner Cable, with the hope that regulators will see both deals as changing the telecommunications industry, three of the people said. The regulators blocked AT&T’s effort to acquire T-Mobile in 2011.

Son’s team thinks AT&T was unprepared when it attempted to convince regulators a deal was in the public’s interest in 2011, three of the people said. Sprint is working to ensure it will have a detailed case to put in front of regulators, the people said.

Sprint also wants to avoid agreeing to a high termination fee because it could provide regulators with an incentive to reject the deal, one of the people said. AT&T had to pay T-Mobile $6 billion in cash and spectrum after its attempt was blocked, a move that Son views as a strategic mistake because T-Mobile became a stronger competitor as a result, the person said.

Any deal would need to be approved by the boards of SoftBank, Deutsche Telekom, Sprint and T-Mobile. This could be a lengthy process and may slow down the timeline on when a deal is announced, the people said.