https://community.o2.co.uk/t5/Android/O2-compatibility-with-US-carriers/m-p/1623938#M79874 <P>Hi. Just joined O2 (again) after spending the last few years with another carrier.&nbsp;</P><P>I'm on a SIM-only contract which I was attracted to by the free roaming, especially in the US.</P><P>I have an OPPO Reno2 which has given me no problems; it's the first ever phone which has been trouble free for over three years, previous phones seem to have failed after just over two years of use.</P><P>Anyway, back to the question. I don't seem to have any way of switching on 4G and Wi-Fi. In the MyO2 devices tab it only shows a SIM (which is fair I suppose).</P><P>I have checked the carrier icon and it shows 4G next to the four bars carrier signal. As such I thought "that's OK for the USA", and Wi-Fi calling should be available.&nbsp; However, when I checked my IMEI on the O2 website it said not compatible. I have a backup PAYG SIM with Three and that allows Wi-Fi calling so I'm a bit stumped.</P><P>Now, and this is the nub of the question, is the IMEI saying the handset is incompatible because of wireless frequencies, or is it the lack of an O2 ROM.</P><P>&nbsp;</P> Fri, 09 Jun 2023 12:59:30 GMT Alistairm1 2023-06-09T12:59:30Z https://community.o2.co.uk/t5/Android/O2-compatibility-with-US-carriers/m-p/1623938#M79874 <P>Hi. Just joined O2 (again) after spending the last few years with another carrier.&nbsp;</P><P>I'm on a SIM-only contract which I was attracted to by the free roaming, especially in the US.</P><P>I have an OPPO Reno2 which has given me no problems; it's the first ever phone which has been trouble free for over three years, previous phones seem to have failed after just over two years of use.</P><P>Anyway, back to the question. I don't seem to have any way of switching on 4G and Wi-Fi. In the MyO2 devices tab it only shows a SIM (which is fair I suppose).</P><P>I have checked the carrier icon and it shows 4G next to the four bars carrier signal. As such I thought "that's OK for the USA", and Wi-Fi calling should be available.&nbsp; However, when I checked my IMEI on the O2 website it said not compatible. I have a backup PAYG SIM with Three and that allows Wi-Fi calling so I'm a bit stumped.</P><P>Now, and this is the nub of the question, is the IMEI saying the handset is incompatible because of wireless frequencies, or is it the lack of an O2 ROM.</P><P>&nbsp;</P> Fri, 09 Jun 2023 12:59:30 GMT https://community.o2.co.uk/t5/Android/O2-compatibility-with-US-carriers/m-p/1623938#M79874 Alistairm1 2023-06-09T12:59:30Z https://community.o2.co.uk/t5/Android/O2-compatibility-with-US-carriers/m-p/1623947#M79875 <P><a href="https://community.o2.co.uk/t5/user/viewprofilepage/user-id/5187578">@Alistairm1</a>&nbsp;See this guide:&nbsp;<A href="https://www.o2.co.uk/help/network-coverage-and-international/travelling-to-the-usa" target="_blank">Travelling to the USA | Help &amp; Support | O2</A></P> Fri, 09 Jun 2023 13:27:20 GMT https://community.o2.co.uk/t5/Android/O2-compatibility-with-US-carriers/m-p/1623947#M79875 Bambino 2023-06-09T13:27:20Z https://community.o2.co.uk/t5/Android/O2-compatibility-with-US-carriers/m-p/1623952#M79876 <P>Bambino, many thanks for this. The list of supported handsets is a real help.</P><P>&nbsp;</P><P>&nbsp;</P> Fri, 09 Jun 2023 13:39:21 GMT https://community.o2.co.uk/t5/Android/O2-compatibility-with-US-carriers/m-p/1623952#M79876 Alistairm1 2023-06-09T13:39:21Z