So sorry to hear about this, have often wondered what would happen in just that situation.
In France we often have to supply a FRENCH mobile phone number so we can be contacted by a driver of a delivery vehicle. I have in the past had a French mobile but I never use it and if you buy a pay-as-you-go card for it, you HAVE to keep using it or the number drops off, even if there is money on the SIM. If you let the money run out you are bugred and have to buy a new SIM. so in order to be able to get the delivery I give them an old number.
HOWEVER, I would say that in your interests and to stay safe when travelling, it is still a good idea to get a cheap mobile phone, doesn't even need to have a camera on it, with something like a Tesco mobile phone card in it. It'll cost you peanuts and the money on the SIM will stay as it is. no need to keep topping it up. THEN you could take it with you purely when travelling and could use it if you break down, or have some other emergency, which is why both of us ever got our first mobile phones. TBH this is more or less all I carry mine for. At least my original Motorola. I leave it in the cubby box of the Disco.
Something like this.https://www.tescomobile.com/110-4g?color=blue&tariff=500mb&s_kwcid=AL!12341!3!!!!x!!&gclsrc=aw.ds&gad_source=1&gclid=Cj0KCQiAwbitBhDIARIsABfFYIIEw8Yf5zgtJ-nGOHTE5Lti4nlvIL0e8eI_DQZUod7n2jb3mxSoeuUaAhxPEALw_wcB&gclsrc=aw.ds
Cheap and cheerful.
(My other mobile I only got because we had to have proof of Covid vaccination when we went over there and wanted to go to restaurants, outdoor jazz concerts etc. Sadly this now has to be used when abroad to sanction payments of highish value with my Halifax card. Also a bit handy when travelling and staying in hotels, or with friends, with Wi-Fi.)
I think everyone knows how much I hate mobile phones and I admire your stance and your bravery in going sans-mobile in your everyday life!