Yes. The system is designed to cover every laboratories freezer no matter where it is located. As long as you have an Ethernet port that connects to internet where your freezers are located and a cellphone that can receive SMS, you are good to go.
As a matter of fact, we actually already have users outside United States. We even have a cluster of server in east asia to support our service there.
Yes, we think so too. We actually first built our prototype with a cellular modem. However, when it comes to coverage and operating cost, cellular connectivity is no match to Ethernet.