Looking into the 435 for traveling and as a Wifi calling capable backup phone with Tmo. They are selling for $29 at Walmart and everything considered the price is tempting to have it around. I remember the 530 was basically garbage screen wise. How happy are you with screen, endurance, connectivity, voice and audio quality? Thing with Tmo USA is that Lumias are very scarce now and I prefer a branded phone over an unlocked one for the wifi calling feature for travelling. Otherwise I am quite happy with my ATT 640 on Tmo.