If you're looking for a great "dumb phone" then one to consider is the new Nokia 105. You can get it for £14.99 at the minute from amazon https://amzn.to/2DAZHWr put yourself on the cheapest goodybag and don't worry about that blasted internet for a while. I ahve one of tehse for when I go on holiday so I can escape the interenet. These phoens are great value, work really well and are super simple to use so make a great phone for anyone non technical too. Well worth considering.
as new from o2 from £5. https://www.o2.co.uk/shop/phones?contractType=payasyougo#sort=content.sorting.lowestOneoffCost&page=... no airtime credit to buy.