Lyf flame 3 is cheapest 4g mobile and it is not worth to buy because its performance is very bad because it will fail to save photos because of its less ram and even it very very slow while using net and even friend I got free realince jio 4g sim and I was using this sim in this phone so that there was unlimited internet and calls was free and even my friends were also using this sim and they were using very well and free calling and net coming to me it was not at all wornking in my phone. It was mobile problem only. Later serverse center solved my problem