How much should they cost please? I see prices range from 6 to 30 Euros & more.
The phone is a 'Primo 413 by Doro' I bought one via Amazon of the lower price & it didn't work so it's been returned.
Price depends on storage capacity...but stick to a decent make (like SanDisk or Kingston). And don't choose a large capacity if your phone can't handle it.
Your phones manual will tell you how much external storage it can use, don't exceed that limit.
The more GB, the more it will cost.
As said, buy a good make and I would buy the largest the phone will take.
Beware of fake memory cards
I usually buy memory cards from supermarkets. Then there's a reasonably good chance that the product that I'm buying is actually genuine, rather than one of the countless fakes that abound on eBay and Amazon.
So, not all micro memory cards are the same ? I know the storage capacity varies, but different phones need different specific cards - is that correct ?