I don't know if this will help, but my son always goes into an 02 phone shop, sometimes he upgrades, and sometimes he downgrades depending on which phone he likes at the time. 02 have a special deal at the moment that means you can upgrade or downgrade for free every 90 days provided you keep your new phone in mint condition. Should be fine if you just need to try it out to see if it's a phone your husband can use comfortably.
Having had a mother who was disabled, it really helps if you could go in and play about with their display phones so you stand a fighting chance of getting something you think might be useful. You are stuck with 90 days however regardless.
