When you are drinking a drink through a straw only a little bit of the drink gets through at a time. Get a bigger straw more drink gets through at a time. Get a bigger drink and it takes longer to drink it all through the straw. Cellular networks are the straw. The people on their phones are the drink. The networks can only handle so much traffic at once before they get bogged down making it slow for everyone.
Even though you have 5 bars that’s just the strength of the connection. Like the drink knows there is a straw but still has to wait for its turn to go through it.
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