Does the interest rate change on a simple interest loan?

Say for example I get 8% for 30 years on a simple interest mortgage. Can that rate change in that time or does it stay the same for the duration of the loan? Thanks!

I am looking for a bi-weekly with extra payment, simple interest mortgage excel templete/spreadsheet? I want to see how a combination of bi-weekly and extra payments will affect a 15 or 30 year loan.

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