2gbps is only going to be available in areas with towers that support the frequency required and have enough available bandwidth to offer that speed. It will also depend greatly on which phone you have as some won't have a chipset capable of that speed. At present the 5G map shows 5G 3500MHz service in a small number of cities and even if there is a 3500MHz capable tower nearby, it doesn't mean you'll see crazy speeds.
5G, especially at higher frequencies, can be more easily impacted by environmental factors than LTE. That includes buildings, walls, etc. If you were right at the tower, the antennas would have been above you and aimed away from you so you would need to be a short distance away. If you want to see a map of towers, you can see one here. 5G can also use local repeaters as well so the tower isn't the only source. The repeaters are often on light or utility poles and look like little white boxes. They are not 3500MHz though.
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