no sim card installed in iphone 4
 

pleas iwant a solution for this problem in my iphone 4
itry to put the many sims but still this problem

thank you :):)

https://s30.postimg.org/b0sj1zx5d/No_sim.jpg

Before doing this, check if your date and time is correct.
Also check in setting / about / modem firmware
If your modem firmware has no version number. Then your baseband is defect.