Please go to your phone SETTINGS and look for MOBILE or PHONE. Look for SIM. For those of you with phones that can take an E-SIM, Please download the eSIM app from ROAMLESS https://roamless.com/esim We will cover an initial credit when you get to Singapore, but after that you would need to top-up if you run out of credit. It will be best if you get the chance to download the app in advance. [You may need to check that your phone is UNLOCKED for international travel. If your phone does not take E-SIM and must only use a physical SIM, we will arrange, but you must let us know in advance, as this is a bit more complicated these days.