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Can smart home security cameras work with overseas cell phones?

Yes they can. Most systems have remote access capability so you should be able to log in via the internet and view on a smartphone, tablet or computer. One thing to be wary of though is if you were accessing over 3G or 4G rather than WiFi this could potentially lead to excessive data charges from your provider, depending on your allowances.
[Question posed during National Home Security Month 2015]