how to edit items in laravel collection

I am new in laravel, I run a query and get rows from database and I want to edit a column of this rows before get them in view. So here is my code piece

$callPlans = CustomerCallPlan::whereNotNull('id');
        foreach ($callPlans->get() as $callPlan) {
            dd($callPlan);
        }

and the output screenshot:

I need to replace all the 'x' characters with '-' of "numbertemplate" column..

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