@Lindabee
The internet suggests it's preferable to use a specialist M2M SIM rather than one which gives access to a single network.
I'd suggest you consult the documentation which came with the tracking hardware.
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Sky Glass 55" (on ethernet) & two Stream Pucks (one ethernet / one WiFi)
BT Halo 3+ Ultrafast FTTP (500Mbs), BT Smart Hub 2
