[DNSB]

Originally Posted by JSWolf

I have used a US iPhone in Scotland with no noticeable problem.

Here's a list of the frequency bands in use in Canada and the United Kingdom.

Please note that while some frequencies overlap, there are many that don't.

Canada
GSM
850 MHz
1900 MHz (PCS)

UMTS
B2 (1900 MHz PCS)
B4 (1700/2100 MHz AWS 1)
B5 (850 MHz)

LTE
B2 (1900 MHz PCS)
B4 (1700/2100 MHz AWS 1)
B5 (850 MHz)LTE
B7 (2600 MHz)LTE
B12 (700 MHz ac)
B13 (700 MHz c)
B17 (700 MHz bc)
B25 (1900 MHz +)
B26 (850 MHz +)
B29 (700 MHz de)
B38 (TD 2600 MHz)
B46 (TD 5900 MHz)
B66 (1700/2100 MHz)
B71 (600 MHz)

5G NR
N1 (2100 MHz)
N41 (2500 MHz)
N66 (1700/2100 MHz)
N71 (600 MHz)
N78 (3500 MHz)

United Kingdom
GSM
900 MHz (E-GSM)
1800 MHz (DCS)

UMTS
B1 (2100 MHz)
B8 (900 MHz GSM)

LTE
B1 (2100 MHz)
B3 (1800 MHz +)
B7 (2600 MHz)
B8 (900 MHz)
B20 (800 MHz DD)
B28 (700 MHz APT)
B32 (1500 MHz L-band)
B38 (TD 2600 MHz)

5G NR
N1 (2100 MHz)
N3 (1800 MHz)
N7 (2600 MHz)
N8 (900 MHz)
N28 (700 MHz)
N77 (3700 MHz)
N78 (3500 MHz)