List of countries by mobile phones in use
en.wikipedia.org
en.wikipedia.org
There are 74 countries on the list and only three have very unusually low figures: Cuba, North Korea, Ethiopia. The first two are obvious, the last one has probably changed a lot since ~2013.
After that you spike up to Lebanon at 64 phones per 100 people, with data from 2010. So that's probably 90+ now.
The extreme majority of all adults globally now have a mobile phone, even if it's a $20 KaiOS phone.
Hong Kong is at the top that way...
Edit: or maybe multiple sims per phone
I wondered if perhaps some of these are also business numbers? Unless they were excluded?
Also for tariffs across providers. It isn't unusual to have one carrier better for data and another for voice/sms.
Another significant factor is contacts. If your contacts are on one network and you are on another, there is enough motivation to get a second device as intra-network is cheaper than cross-network
The percentage would be cool to compare across countries, but sadly it is not possible with this data.
But certainly a more insightful way of viewing this data than the totals alone.