Your EU SIM will incur standard international roaming charges here. Consider a local SIM or eSIM.
Roaming Zone Memberships
ASEAN adopted a Framework on International Mobile Roaming to promote transparency and encourage voluntary price reduction among the 10 member states. Unlike the EU model, ASEAN does not mandate free roaming — instead it focuses on transparency, consumer protection, and encouraging operators to offer competitive roaming packages. Some bilateral reductions exist between neighboring members.