I was able to insert and activate a new SIM card in this phone. My Mobile Virtual Network Operator runs on the Rogers GSM network, and I was able connect without issue. I successfully made an outbound call and sent/received text messages.The positive features of this phone for a senior:1. Large buffered buttons, kind of like an oversized calculator. A low vision person can easily feel the delineation of each button and the text on the buttons is large format.2. Very simple process for making a call: just unlock the phone and start keying in the numbers. There is no overwhelming number of apps and pages through which to scroll.3. SOS function is versatile. I configured and successfully tested the red SOS button on the back of the phone to emit a very loud alarm and to initiate both a text message and phone call to a phone number of my choice. There is also an option to set multiple numbers and to customize the emergency text message that is sent.The less positive aspects:1. While it is easy to make and receive calls, and to read texts, I believe a senior person with dexterity and/or cognitive issues could struggle mightily with the system for writing text messages on this phone. The typing system assigns multiple values to each key. For instance, with the 2 key, you get "a" with one tap, "b" with two fast taps, "c" with three fast taps, and "2" with four fast taps. Hesitate even a split-second between taps, and you end up with the incorrect character.2. Since the screen is quite small relative to an iPhone or Android phone, all Settings are hidden in various sub-menus. For a person with any sort of cognitive impairments, it could be easy to get confused trying to figure out where to go and what to do. While the main menu of actions is fairly straightforward, as someone who works with technology regularly, even I didn't necessarily find everything intuitive. For instance, I wanted to mute the ringer, which I expected to find in the Phone Settings area. However, there was no option there, and lowering the physical volume button didn't achieve the outcome either. I finally discovered that the mute option for the ringer is under "Profiles", which contains the options General, Silent, and Meeting. Silent means mute whereas Meeting means vibration, which I had to test to figure out.3. There are some inaccuracies in the instructions. For instance, it discusses a "Video Recorder," but unless my eyes are really missing the obvious, I don't see a camera lens anywhere on this phone.In conclusion, the usefulness of this phone really depends on the challenges of the senior in mind and the intended uses of the phone. For instance, I think this phone is best suited for a senior person who mainly needs to make calls and to read (as opposed to write) text messages. While the phone has many other hidden and potentially useful features, unless the senior is particularly adept at technology and has no cognitive issues, it is hard for me to envision him/her using many of those features. For instance, the phone apparently does have a browser, but it seems to me that any senior with the patience and dexterity needed to use the multi-press typing system to key in a URL would be better off using a full-sized iphone or Android phone.