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Dear O2 Community, I'm looking for a Data Sim for a 4G Router where the provider will not block traffic/ports. I currently have a home alarm system that stopped talking to the cloud after 6 weeks of connectivity due to the wrong sim car being provide...

Router = TP-Link Archer MR600 / O2 Unlimited Phone/Text/Data Sim Background:Contract Started Mid September 2019 (unlimited Sim)Home Security System (Riscogroup) was connected to cloud until 6th Nov when it went silent. Swapped O2 Sim for a Vodaphone ...