I still have a dual-SIM phone with my local and home SIM cards. Keeping the home SIM active on a cheap pre-paid plan is cheaper than paying for roaming on my HK SIM when I go home to see family. If you get a new dual-SIM phone just make sure it's dual active SIMs (not one active one standby), and both are 4G, because countries are slowly turning off their 2G/3G networks at their own schedules. I quite like having dual active SIMs for traveling other places anyway, keep my HK SIM and pick up a local SIM wherever I'm traveling.