Singapore

KarenCr_1274261  It will work if you have the APN set to mob.asm.net

The problem is that your Smarty plan does not cover use anywhere other than the UK and EU.

In addition to good advice from SmartyTrousers , check out the Smarty Price Guide for details of charges.

Only if you add additional credit to your account, but it's very expensive - 1GB of data would cost around £100.

If your phone supports eSIM, a much better option would be using an eSIM provider like Airalo. They would charge you just £3.50 for 1GB of data.