Our Canadian cell phones stay at the house/condo we rent running off WIFi. We bring our old phones with us. We wipe them clean at home, do all of the updates and put only basic contacts in them. No apps with banking info. No credit card info on them. A Sim card at say a TelCel store is about 20.00 (don't remember the real amount - been a few years since we purchased one) and get a Mexico cell plan. Cell plans are SUPER cheap there. All include calling to USA and Canada. This price list is a few years old but you will get a great idea how much it will cost for a plan. I believe the OP is staying for 7 days. A 7 day plan is 50 pesos for All 7 days. Then when we are at home and will be flying back to Mexico we sign up on an app called DING. This allows us to add a plan before arriving in Mexico. We have Apple phones and have the AirPods installed to work off of our Mexico phones. We put the AirTags in our checked luggage so when we land and turn the mexico phones on we can check to see if our checked luggage made it to Mexico and approximately where it is.
View attachment 816477