I had the same question was hoping for a solution. I plan on contacting a local store which I would think they could help> I would think you could port IN a # on you free line. Mother's # goes inactive in a "holding pattern" and belongs to T-Mobile. Buy a 1 month prepaid and have your Mothers # assigned to it and then port out. Cost should minimal compared to retaining free line. This is not confirmed info just my opinion of what may be a possible solution.
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