Can I change 4g carrier as simply as changing the sim card as I would with an unlocked mobile phone?

We would like to use our I pad4 for travelling and staying in contact with friends and relatives by using sim cards purchased locally in the countries which we choose to stay in rather than hoping that one overpriced UK data carrier will provide a service for all.... We prefer to use wifi whilst in UK and not have a UK carrier at all.

iPad

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