Consumer Cellular offers a free $25 credit on any new line. Sign up using this link and you'll also get another $25 credit on your first month's bill. Consumer Cellular recently increased data allowances for the 12th time in a row without raising rates. Get a plan with 10GB of LTE data for just $35 per month (or 3GB for $25). AARP members save an extra 5% as well.
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