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[1] Using mobile phone's modem to track shipment would involve in compatibity with different cellular networks in various countries.
[2] Using a bar code reader, an item is reported in the system, which is associated with an entry in database.
[3] Using passive RFID reader, an item is reported in the system, which is associated with an entry in database.
[4] Active RFID tag could send its identity to a farther range to its antenna. Users could associate a large container with an active RFID tag. The tag ID is also an entry in database.
Coupling all of technologies above and placing antenna at right places, you could track your shipment easily across many regions.
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