[Q] unlocking sim lock Samsung B5510

hello, im new here

so i have a problem
my lil sister bought a Samsung B5510

but it has a sim-lock
now i found a app that could find a unlock code
cant post the link since im still a new user (wich i understand)
but it seems it needs to be "rooted"
how can i do this since all phones have a other way to get rooted it seems ?

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