I found a survival RPG called Day R for my phone.
It was a bit addictive so I have taken a break from it at the moment but it is very detailed and rather good... you basically wake up in the middle of a street in late 1980s Soviet Union, and you basically try to learn skills and find material to survive. You find tools but can also make some tools and as you use your skills you get better. The main source of food to begin with is giant rats, but over time you come across more serious enemies like Lynxes and zombies etc. There are no other people... bodies in places... and craters and radiation everywhere. You have Survival skills (ie making torches for searching buildings at night, building shelters, making fishing rods, boiling water to make it clean to drink or make bandages), sewing skills (making some clothes repairing things, making backpacks to carry more gear), chemistry skills to make bandages, mechanical skills to repair bicycles and motor vehicles so you can travel further and faster, as well as make tools and weapons, cooking skills to make food last longer.
For instance when you kill a rat you can butcher it, which gives you pieces of raw meat and bones. The bones can be used to make a bone based glue but you need a pot and some other things. If you have a fire you can cook the meat so it will last a couple of days. If you have the survival skill to make a drying rack, you need wood (from forests) and rope (found in some houses), and you can dry out the meat over a smoky fire so it will be OK to eat for months.
When you start out if you find some flint and some paper, you can use a skill to make a flint and steel to start fires.. later on as you gain survival skills you can make a fire lighter from a piece of flint and a shell case and other things, but you can also find a lighter if you are lucky.
You can gain credits which you can use to buy stuff... with real money or watching adverts.
You get a free gift if you play every day, like a lighter, or a torch, or 10 tins of meat or whatever.
I found it to be detailed and simple enough but a little frustrating... you need to keep moving to follow a storyline and to find new resources, but that is difficult as you can't just run around with everything in your pockets so often you leave stuff behind and when you get to new places there are things that are there and things that are not. Most cars on the street are broken down so you need to build up your skills to learn to fix them... until you can fix them you take the petrol from them for other things you make like a gas burner or lighter, or for making torches to light your way searching at night.
Found it in the play store on my android phone... it is called Day R.