Are you on contract or PAYG? Did you use that SIM for making calls or texts in UK before you left to go abroad?
If you are on contract, 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. Also try selecting a network manually rather than auto.
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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
