@Juyeong : Where are you? Which airport? Where are you going to/coming from?
Without that info. I'll just have to guess.
Did you buy an EE PAYG SIM at a UK airport, get on the plane w/out using it all & when you landed somewhere abroad you can't use it at all? If so, that doesn't work. EE PAYG SIMs need 1st activating on EE's home UK network. If it wasn't you can't now use it until you return to UK.
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To phone EE CS: Dial Freephone +44 800 079 8586 - Option 1 for Home Broadband & Home Phone or Option 2 for Mobile Phone & Mobile Broadband
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
