What is the best method for mortgage loan interest rate shopping?

I have been pre-approved for a mortgage loan, but have been told the interest rate cannot be determined until a contract has been signed for a house. If this is true, then how is it possible to shop around for the best interest rate available based on my credit scores other personal information? I don’t want to settle for the first mortgage lender (referred to me by my real estate agent) without shopping around for others who may be able to beat their interest rate.

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