Can I use my Xperia phone outside of Europe?

Dual-band/Tri-band/Quad-band explained

In short, yes, your Xperia phone is very much usable outside of Europe. In the past, phones were limited to a specific frequency spectrum in which they operated. For example, European phones operated at a 900 MHz and 1800 MHz spectrum, while American phones operated in the 850MHz and 1900 MHz spectrum.

Occasionally, travellers would experience issues if their dual-band (meaning two frequency band) would not match the destination frequency. 
However, this is a thing of the past, and most phones are more than equipped to match any local frequency. They have evolved to Tri-band and even Quad-band, abolishing the restrictions of the past.

All our current phones can handle global frequencies. Therefore, technically speaking, you can surely use your Xperia phone outside of Europe. 
However, it’s always a good idea to have a word with your service provider about roaming and SIM locking. 

Roaming 

Roaming is the term used when you are using data on a mobile network abroad. Similar to different ratings when making a phone call, roaming might induce higher tariffs. Luckily, roaming charges within the EU were abolished in 2017, but outside this territory, different rates might apply.

Always check with your service provider for further details on potential costs and preferred local operators before travelling abroad. 

• How to select an operator:
  Settings > Network & Internet > Mobile Network > Advanced > Network
   
• How to enable/disable data roaming : 
  Settings > Network & Internet > Mobile Network > Advanced > Roaming

 
SIM-locked phones

A different limitation you might encounter is a SIM-locked phone. Some operators ask the manufacturer to lock the phone so that they only work with that specific operator’s SIM card. If you would switch the SIM-card with a local operator’s SIM when travelling or moving, you lose your phone/mobile data capabilities.

Verify with your operator whether or not your phone is sim-locked. Alternatively, you can test it by putting in a different SIM card from a friend or relative.