Yeah, spot on with Viber-both folks gotta have it installed for those free calls and chats to click, otherwise you’re back to pricey regular SMS. If your tita or whoever isn’t tech-savvy, WhatsApp’s a solid backup; it’s free too, but same deal, needs the app on both ends. I’ve hooked up my lola with it, and now she’s sending voice notes like a pro (though half the time it’s just her yelling at the dog).
On data plans, if you’re in the US or wherever, check out Mint Mobile or Google Fi-they’ve got affordable international roaming that works wonders for apps like these without breaking the bank. Here in PH, Globe or Smart’s got prepaid loads with data promos that stretch far for Viber use. Pro tip: Use WiFi hotspots at malls or cafes when you can; saves data and lets you pretend you’re still on vacay. What’s your setup like, guys-Android or iOS? Might tweak the recs based on that.