Based on reviews posted on popular review sites as well as from ATT ML17939 2 Line Corded Telephone's website, ATT ML17939 2 Line Corded Telephone performs very well in terms of product guarantee relative to other business phone system stores.
The review site amazon.com gives ATT ML17939 2 Line Corded Telephone excellent ratings for product guarantee in a review posted on its website. Specifically, this reviewer pointed out the following:
After walking me through a few fixes which did not work, the AT&T customer service agent said I could return the phone, at my expense, for servicing as it was within the 1 year warranty period.
One reviewer on resettips.com said ATT ML17939 2 Line Corded Telephone performs well on product guarantee relative to its peers. You can read the full review here. Here's a brief quote from this review:
This isn’t long lasting. According to the manufacturer it lasts in a 1 year warranty
Learn more at the company's website.
You can also check out the top 10 business phone system stores for product guarantee, or the overall best-performing business phone system stores on our main review grid.
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— reviewed AT&T on September 7, 2020, Read all 2 warranty reviews.