Did you activate roaming on your EE a/c before you left UK by texting ROAMING to 150? Having a roaming add-on doesn't of itself activate roaming on your a/c.
Often just rebooting the phone is the simple remedy. Otherwise try logging into your MyEE account online & go to Menu > Account Settings > Control Content > Roaming Abroad and also Call Abroad and Premium Rate. They will show as ticked if roaming and calling abroad is activated. If they are not ticked, can you activate these settings?
If not already enabled, you need to call CS to enable the Roaming Abroad and Call Abroad and Premium Rate settings of your MyEE.
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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 (no landline number)
