Following as I am interested to hear what people propose. This isn't a solution to your question but I used to change countries a lot and did the following: U

Following as I am interested to hear what people propose. This isn't a solution to your question but I used to change countries a lot and did the following: UK number: for my whatsapp + OTPs for all my UK stuff Local sim: for data, calls and texts (I kept my whatsapp number to my UK one initially but it got tiresome telling local people my international number so I ended up just moving my whatsapp to the local number each time and keeping my UK number on a Nokia burner phone for OTPs - it's pretty easy to switch number on whatsapp these days and ensuring everyone gets updated) International numbers outside of UK & local: I used to have numbers for other countries via Skype e.g. US where a landline/local number was useful when applying for jobs I never had any need for OTP on non-local/UK numbers, nor desired to use them for other stuff so it worked quite well for me but as mentioned doesn't offer much in relation to your question Hope you find a solution