Joe is traveling to Asia and he wants to know if it's better to get an international data roaming plan or get a local SIM wherever he goes. He uses Verizon. Leo says that Verizon is the most international unfriendly mobile carrier. Sprint, AT&T, and T-Mobile have their own reasonable plans (especially T-Mobile that offers a free slow internet). Verizon has a $10 a day plan, though, which isn't bad, but it adds up. It's going to be the easiest way since he would have to have a different SIM for every country he visits, and his phone number will change with each new SIM card.
If he's interested in saving money on data, he can head over to prepaidwithdata.wikia.com. It will have up to date information about every country in the world, including what SIM cards to get and how much they cost.
How about security? Leo says that cell phones encrypt by default, but he'll want to be sure that it's enabled, and set it up that when the security passcode gets tried 10 times, it wipes the phone. He should also make sure he can remotely wipe the phone should it get lost or stolen.