Any way to prevent losing Whatsapp chats with international SIM?

I'm going overseas for the year tomorrow and upon my arrival, I will be getting a SIM card for that country to put in my iPhone. I'm an avid Whatsapp user and am in many groups. I have heard that when you put a new SIM card in your iPhone, you lose all your contacts, including messages and Whatsapps. Is there anyway to prevent this from happening?

Backup whatsapp messages in iCloud.

Read here: http://howto.cnet.com/...to-icloud/

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