Buy a local SIM in France (Orange), Germany (Telekom), or Thailand (AIS). Insert it and enjoy local data rates (as low as €10 for 100GB). Without unlock, roaming on Vodafone would cost £6/day.
The most legitimate and safest way to perform a is directly through the carrier. Vodafone has specific criteria that must be met before they will release the unlock code (often called an NUC - Network Unlock Code). vodafone r219z unlock
No waiting for email; total control. Cons: Requires Windows; technical knowledge needed; no refund if failure. Buy a local SIM in France (Orange), Germany