@CBiggs : You must have been near it but on mainland UK. This'll happen when you are in a weak or no signal area of UK but are receiving a signal from a nearby country, thus making it seem as if you are roaming.
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To phone EE CS: Dial Freephone +44 800 079 8586 - Option 1 for Mobile Phone & Mobile Broadband or Option 2 for Home Broadband & Home Phone
ISPs: 1999: Freeserve 48K Dial-Up > 2005: Wanadoo 1 Meg BB > 2007: Orange 2 Meg BB > 2008: Orange 8 Meg LLU > 2010: Orange 16 Meg LLU > 2011: Orange 20 Meg WBC > 2014: EE 20 Meg WBC > 2020: EE 40 Meg FTTC > 2022:EE 80 Meg FTTC SoGEA > 2025 EE 150 Meg FTTP
To add - this is the standard warning text you receive when your phone connects to a foreign network.
Anywhere your home network has coverage, you will use EE's network. If you have no service from EE but a foreign network instead, phones will connect to those by design.
For you to connect to a Manx network suggests you may have been around coastal or mountainous Cumbria.
