Duplicate IPs can be seen depending on how carriers lease IPs from their IP pools. In such cases, you can get access to more IPs by:
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Using multiple mobile carriers.
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Switching some modems to 3G only which would have different IP addresses. 3G networks address pools are different than 4G. (This option is not recommended as you will get 20-30% lower speeds)
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Use signal boosters to tap into neighboring allocations. This step requires experience and not easy to implement.