International roaming is easy, but expensive. Alternatively, you can use a foreign phone company, but you need to first make sure that your cellphone is compatible.
The Huawei G610 or G610s is a mid-range phone with many features. Unfortunately, it compares poorly with other available options.
The Nokia Lumia 1020 comes with an excellent camera. As long as you require such a camera, it is a very good product with a few drawbacks.