We all want to make sure we are fully utilizing all the features with our devices HGinspring. Glad to hear that you are enjoying your device and that the internet is working correctly for you. Are you using the Mifi 5510L hotspot? When trying to search the model number provided, this was the closest device I could match. For the 5510L, the port forwarding feature is not available. Sorry about that! Here is a link for you to make sure this is same device that you are using: http://vz.to/1Kir07d.
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I’ll assume your idea is Camera <> TL3040 <> Mifi5510L with no additional hardware, correct? The idea is good, unfortunately port forwarding doesn’t actually work on Verizon mobile hotspots without a public facing static IP address. The only other solution is to find a service provider with a hotspot and a public IP address, but since most are using AT&T or Verizon that might be difficult.