If you are dead set on traveling with an iPhone and don’t want to spend a ton of money on a newer model, the iPhone 8 makes for a nice option. These are ‘renewed’ phones sold by Amazon which are verified to work well. They are unlocked meaning you can use local SIM cards without issue. I find these to be a great value.
Apple gave the world iPhone 8 in 2017. Swapping aluminum for a glass-encased front and back, the 8 packs an upgraded front and rear camera, touch ID, plus a super-fast and super-smart A11 Bionic chip. In addition to improving its looks, the glass backing also makes wireless charging a breeze. 4.7″ display, 2 GB RAM.