Hello @nanone, let me start by giving you a warm welcome to the Fitbit Community.
It's a hard question you have brought to our attention. I was reading an article a few weeks ago about the best phones under budget and the only one around the price you are looking was the Sony Xperia E5 with a price ranged of £149 among other models that goes to the Honor 6x with a price around £215.
When I saw your post I look for the same article and compared all the devices with our list of supported devices and despite these devices has all the hardware requirements to be a supported; they are not.
The tricky part is to give you a direct answer since with non-compatible phone we cannot guarantee how it will behave the tracker and the app in relation to the mobile phone. There is a full line up of Samsung mobile phones compatible with the app, but I'm not sure how much is the price since it may vary according to the provider or the retailer.
Rest assure our team is always working to test and add more Android devices options to the supported devices list, so keep an eye open for future updates.
The best here is go to the store or your service provide to see what option they have around the price ranged you are looking for and compare the phone against the list of our supported devices. Or if you have a model in mind please share it in our Community and perhaps someone who is using the same phone might give us some insight.
See you around and let me know if you have more questions.
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