You should check zongs speed and signal strength in your phone first if you are getting speeds like 20mbps+ then its good.Is zong's rating scheme on their site's 4g map accurate? It shows that in my area's block their 4g is excellent. I know the speed depends on a lot of factors such as distance from tower and number of people using their 4g in the area etc but normally would I get good speeds and signals? I don't thing anyone uses zong's mifi or wingle here in my street. And if they show that it should be excellent then that should mean their tower is near by.
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Other option to check signal strength is to install opensignal app.
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