Will this phone work solely from a SIM card? Looking for something suitable for my grandmother that's not an actual landline, but works like one from a sim card alone as she is now living in a care facility.
Yes, this phone works with any SIM card, its unlocked. Please double check with your SIM provider if the frequencies of the phones are compatible with them: Frequencies GSM (2G) 900/1800 MHz, UMTS (3G) 900/2100 MHz, LTE Bands (4G) 1/3/7/20/38