Are there any countries where BT Mobile won't work at all?

Yes - a small number:

Ascension Island
Christmas Islands
Cocos Islands
Comoros
Diego Garcia
East Timor
Eritrea
French Polynesia
Kiribati
Marshall Islands
Mayotte
Micronesia
Nauru
New Caledonia
Niue
Norfolk Island
North Korea
Northern Marianas
Palau
Rodriguez Island
Ross Island
Samoa (US)
Western Samoa
Sao Tome and Principe
Solomon Islands
Somalia
St Helena
Tokelau
Tuvalu

Countries where you can make calls but not use data roaming >

Read more about international network compatibility >

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