@IVORYsaint222 : WhatsApp uses data for whatever functions it provides (I'm not familiar with any other than messaging). Outside the EU you will need to buy a data add-on to use it.
Outside the EU, you cannot use your usual UK allowances there but will need to pay the charges or buy roaming add-ons as set out in e.g. https://ee.co.uk/help/mobile/roaming/roaming-costs/countries/india.
If you are on contract, remember to text ROAMING to 150 before you leave UK to ensure the roaming ability is enabled on your account.
If you are on PAYG, make sure you have already used your PAYG SIM to make a call or text in the UK.
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