I don't know your age, but if either you or your husband is over 55 they have a discounted rate.
It's always been sufficient for everything that I need to do, and I use my phone a lot while I'm on the Camino. Also, you can download the maps on Camino apps for offline use, and you can also download Google Maps for the areas that you will be in to use offline.
I use WhatsApp when I can to make free calls, but if I need to call a landline or a phone that doesn't use WhatsApp I use the
Viber app. I buy
"Viber Out" credit which enables me to make calls for only 2 cents a minute using either my cellular data or wifi. $5 worth of credit is usually enough to last me for at least 2 Caminos.