I certainly understand the importance of having the best speeds at all times. I'm here to ensure we get you up to speed. May I ask what specific plan are you on? Are you getting slow data speeds after 15 GB when you use your data on your LG phone or when you connect it via Mobile Hotspot to your HP laptop? Please share more details to better assist.
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The terms of the plan clearly state that once you reach your 15 GB limit you are slowed down to a max of 600 kbps. You can move up to Above Unlimited which will give you 20 GB a month