All cellular devices I know (including LTE) connect by APN. Bridge mode is not available on cellular connections. It means NAT and the number of active TCP connections must be handled by the cellular device. This limit can be easily hit when multiple users do lot of Web browsing.
I should have articulated better, I meant private APN or Public.
Not sure I agree with the port availability limit being hit with mulitple users doing browsing. You would need a fairly large user base to overload a single IP, considering user saturation on AP's, I dont think you would likely hit this limit (which would be more than a few hundred users, ## 200 users would have around 300 open ports to saturate the ports on the NAT)
My question was more around wondering if traffic is backhauled across the private APN to a central location. The reasons for this are IPAM, central NAT breakout, reporting, billing etc
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