Travelling to far east

[EddieD]

I’m travelling to the Far East in February visiting Singapore, Malaysia, Thailand and Vietnam. I’m being told that, in terms of using my phone out there, I’d be best buying a temporary international SIM that covers those countries. Once I put this SIM in my phone will I still be able to retain my existing mobile number? 

[MI5 · Accepted solution]

@EddieD 

No you can't use your number with a foreign sim.

Charges for using O2 can be found here Using Your Phone Abroad → O2 Travel Search Tool | O2

[EddieD]

Thanks 

[MI5]

Welcome