Pay as you go Legacy international texting with WhatsApp

    I have LG Aristo phone on Pre-Paid Legacy plan (which has no data).  I will be traveling to Germany and France and want to know if I can use WhatsApp to text and/or call my friends who are traveling with me.  If so, do I need to leave Mobile data ON or OFF (Legacy plans don't have data so this setting confuses me). Also, is there any way I can text or call my family in US and local German & French numbers on the Legacy plan with WhatsApp or another service without incurring roaming charges?

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