In The 70s With My Smartphone

Su An was an ordinary 20th century girl. Addicted to smartphone, and tad bit too lazy for anything else. Family relationship was ordinary and life was flat and uneventful. When she was transmigrated into another parallel reality in the 70s without rhyme or reason, the first thing she did was searching for her smartphone.
Thankfully,her familiar black phone with green case did follow her through. Su An realised that her smartphone unexpectedly mutated to have unlimited battery and internet. The best part was, it still functional as it did in the modern world.
So Su An play freely in another world depending on her future knowledge and online shopping, get all the opportunity for herself to get rich.

Not historically accurate.