Unlike 2G networks which are being phased out across the world, 3G is still here and as time passes it may also be phased out due to the growth in the 4G and 5G networks globally. 3G is third generation wireless mobile telecommunications technology which was the upgrade from the 2G bands. The 3G networks have higher speeds such as having transfer rates of at least 200 kbit/s.
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You will note that the “G” in 2G, 3G as well as 4G stands for “Generation” when it comes to the mobile networks. Each generation has become faster than the last so 2G is much slower than 4G. Most countries today have 2G networks and many countries have all 3 generations of network connectivity. You can see the APN settings for African countries listed on this website as well as the range of mobile phone specs on this website which highlights this.