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If your grandmother doesn't have broadband then I would recomend looking at Home Phone Saver
Just want a telephone service from BT? Home Phone Saver is our exclusive telephone-only plan that bundles line rental, calls and features into one neat package for just £21.99 a month.
What’s more, we guarantee the price of your Home Phone Saver will stay the same until 2021.
What you get:
You can pay for Home Phone Saver 2020 by any means of payment that we currently accept.
Home Phone Saver 2020 is a telephone only deal, so can't be taken out as part of our BT Broadband packages.
Get a mobile phone? I get unlimited calls for £10 not BT. And she can slip it in a pocket and call from any room.