4G LTE CellSpot Solution Discovered!!! To those who are having an issue with your 4G LTE CellSpot suddenly stop working after a power outage or reset on the Spectrum/Charter ISP network, I have a solution. I am an independent network engineer and the solution took over two months to find but it was worth it. T-Mobile requires that your ISP open the following UDP ports 123, 500 and 4500 with 4500 being the main port for access to the T-Mobile server that allows the 4G LTE CellSpot to connect to the internet. With that done, the CellSpot is able to download your configuration files and access your user profile so that you can get cell coverage in your home. People have been complaining that it has taken up to 5 days for the CellSpot to sync and start working. But that is not why to takes so long for the CellSpot to start working. The real reason the CellSpot stops working or takes days to resync is because your profile has become corrupt and it no longer knows your account in
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