Yes, I've been able to use an iPhone 6 up until now - Line and Whatsapp won't work from November, although the UK HMRC app stopped working a couple of years ago due to unable to upgrade IoS. However I've just bought a ZTE A55 for 2,900 baht (actually got 25% shopee coins, so really 2,200) that does everything I need and more for a tenth of the price of an iPhone.