Follow along with the video below to see how to install our site as a web app on your home screen.
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Careful - is your handset sim locked to your carrier? If so - another sim will not work.
You may want to give t-mobile a call to see if they offer anything. Orange does a deal where you can buy so much data in advance of going abroad. T-mobile might do the same, and you will still have the same phone number.
Other option is to switch off data, and rely on finding free WiFi. Can be a bit tricky.