@juangeas I can't seem to find where you asked about this before and what advice you got for that. Let us know which flex cable you are referring to. Also, let us know if our phone recognizes that there is a SIM card.
Time to open it up and check your coax cables. Make sure they are properly seated etc. Depending on what Flex this is, if you have a replacement, now is a good time to install it.If you need to to a deep dive, use Samsung's flowchart for that.
[image|3074440]
Use your PDF readers search function to locate the components in this document [document|31706]
Use any of these guides [[Topic:Samsung Galaxy A72]] to get into your phone.