Among the 95 countries sampled for its research during the second quarter of 2016, it said 93 had mobile data signals over 3G or 4G available at least half of the time.
WiFi continued to be the dominant form of connection via smartphone in a range of countries with both high and low availability of mobile broadband and the Netherlands topped the list, with 70 percent of all connections measured over wifi, according to the company's inaugural Global State of Mobile Networks report.
The top 10 countries for availability of either 3G or 4G connections were, in descending order: South Korea, Japan, Israel, Australia, Singapore, New Zealand, Finland, Taiwan, Sweden and Canada.
The bottom 10 were, Algeria, Pakistan, Iran, Togo, Nepal, Trinidad and Tobago, Iraq, India, Ukraine and Guyana, the last two of which had less than 50 percent availability of a mobile broadband connection.
By overall speed of mobile broadband, the top 10 were, in descending order: South Korea, Singapore, Hungary, Australia, Denmark, Norway, Netherlands, Lithuania, Japan and Sweden.
The bottom 10 in the survey all came in at lower than 5 Mbps and were: Togo, Pakistan, Senegal, Philippines, Trinidad and Tobago, Algeria, Iraq, Ethiopia, Costa Rica and Afghanistan.
For wifi use, the top 5 in the survey all used the connection more than 60 percent of the time and were: the Netherlands, China, New Zealand, Trinidad and Tobago and Bosnia and Herzegovina.
The bottom 5 in wifi all had connections less than 20 percent of the time and were: Democratic Republic of the Congo, Sri Lanka, Afghanistan, Myanmar and Ethiopia.
Turning to individual countries, OpenSignal said that while South Korea did not have the absolute highest 4G speeds, it led the speed table because the inherently fast technology was the most ubiquitous and it is easier to find an LTE connection than it is to find a 3G HSPA connection.
Japan meanwhile was placed second in 3G/4G availability, but 9th in overall speed, due to its more moderate LTE speeds.
The US ranked 19th in availability, but just 39th in overall speed with slow networks on both 4G and 3G.
Globally, only two countries averaged data speeds faster than 30 Mbps, and only nine had averages greater than 20 Mbps.
Meanwhile, 21 countries averaged less than 5 Mbps and the median speed in the list was about 8.5 Mbps.
