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Have a complete kit with free delivery for a dollar:

£0.96 | DIY KIT GSM GPRS M590 gsm module Short Message Service SMS module for project for Arduino remote sensing alarm https://s.click.aliexpress.com/e/b4tPrIy0

Lots of providers are happy to provide worldwide service for free, as long as you pay $10 per gigabyte. I generally budget 1 check-in per day, of about 250 bytes, so a coin cell can easily power it for a few years with a total service cost for 2 years of just a few cents.

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