I use this that I got on eBay for $46 dollars plus a t-mobile SIM card. I have oil heater that I am using it for.
Cell Phone PDA GSM Wireless Remote Control 3 Socket Power Outlet Smart Switch
FYI... these cheaper cell switch GSM units are 2G. T-Mobile is the only cell towers that support 2G anymore in the US and I think they are being removed from service soon too. If you are buying new I'd stick to 4G units which typically run $120+
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