This is a Desktop GUI app made with python Tkinter which tells the location and sim card data of that particular phone number.

Code on : True-Caller with Python

First we have to install the required library : pip install phonenumbers

  from tkinter import *
  from tkinter import messagebox
  import phonenumbers
  from phonenumbers import carrier, geocoder
  
  t = Tk()
  t.title("TRUECALLER")
  t.geometry("350x165")
  
  
  # get details function
  def get_Details():
      gett = enter.get()
      opt_var = variable.get()
  
      # if entry empty throw error else show op
      if not gett:
          messagebox.showerror("Data error", "Can't keep empty")
      else:
          code_no = opt_var + gett
          phone_number1 = phonenumbers.parse(code_no, "en")
  
          real_phone_number = phonenumbers.format_number(phone_number1, 
                              phonenumbers.PhoneNumberFormat.INTERNATIONAL)
          geo_location = geocoder.description_for_number(phone_number1, "en")
          sim = carrier.name_for_number(phone_number1, "en")
  
          messagebox.showinfo(real_phone_number, sim + "\n" + geo_location)
          t.geometry("350x200")
  
  
  # LABEL1
  L1 = Label(t, text="Enter your Phone number:", font=("poppins", 9), 
            bg="#fff761", fg="#000000", width='50')
  L1.place(x=0, y=13)
  
  # PHONE CODE OPTIONS (you can add more)
  phone_code = ["+91",
                "+93",
                "+32"
                ]
  
  variable = StringVar(t)
  variable.set(phone_code[0])
  
  code_opt = OptionMenu(t, variable, *phone_code)
  code_opt.place(x=46, y=50)
  
  # ENTRY BOX
  enter = Entry(t, width="20", font=("poppins", 13))
  enter.place(x=118, y=53)
  
  # BUTTON
  but = Button(t, text="Get Details", font=("poppins", 10, "bold"), fg="#fffc3b", bg="#454543",
                 width=25, relief="raised",
               command=get_Details)
  but.place(x=66, y=90)
  
  # TANCODES Label
  L2 = Label(t, text=">_TanCodes", font=("poppins", 7), bg="#c5dae8", border="2")
  L2.place(x=140, y=140)
  
  t.resizable(0, 0)
  t.configure(background='#f2fcff')
  t.mainloop()