Before leaving to a certain country please make sure you choose the correct roaming settings option for your iPhone, depending on the country you are going to visit:

option 1

If you are visiting these countries you should:

• enter Orange menu on your handset
• select Roaming
• enter PIN “55555”
• select Manual Mode then Local
• restart your iPhone
• select the operator upon arrival to the country of destination 

option 2

If you are visiting these countries you should:

• enter Orange menu on your handset
• select Roaming
• enter PIN “55555”
• select Manual Mode then Roaming
• restart your iPhone
• select the operator upon arrival to the country of destination
• when coming back to Armenia you should Switch Roaming back to local following the steps described in option 1.