I have Purchased LYF Wind 7 mobile 8 months ago because of jio sim. it gave 24-hour free calling for 3 Month but you I could not talk to anyone continuously because it heated a lot. It also has charging problem, takes much more time to fill up the battery 100% and does not take time to die(shut down). I will recommend you to not to buy any LYF mobile all Lyf devices heated. Heating is not only the problem you will also bound to use a limited app because of its RAM capacity.
Other than that its screen resolution is not good you will find that the others mobiles have good quality display the images get blur. There is only one thing is good in mobile which is camera quality(8 MP).
Please do not buy it, go for other mobile if you don’t wanna bother.