Search manually for networks and select one.

Or did you buy a new subscription with Tele2? In that case, roaming is barred until the first two invoices are paid.

I tried manually select but failed

Hi @paulwongkwan, 

Welcome to the Tele2 Community! Is this bug still playing? As Eric points out, roaming is disabled for the first two months if you are a new customer with us. Have you also tried rebooting your device? This can also help! Hope you have a nice time in France. Will you keep us posted on your findings?