We will aggregate the lists of labels and entries with the zip function. The button will be created and displayed individually, as it does not share any option with the rest of the widgets:

import tkinter as tk

class App(tk.Tk):
    def __init__(self):
        super().__init__()
        fields = ["First name", "Last name", "Phone", "Email"]
        labels = [tk.Label(self, text=f) for f in fields]
        entries = [tk.Entry(self) for _ in fields]
        self.widgets = list(zip(labels, entries))
        self.submit = tk.Button(self, text="Print info",
                                command=self.print_info)

        for i, (label, entry) in enumerate(self.widgets):
            label.grid(row=i, column=0, padx=10, sticky=tk.W)
            entry.grid(row=i, column=1, padx=10, pady=5)
        self.submit.grid(row=len(fields), column=1, sticky=tk.E,
                         padx=10, pady=10)

    def print_info(self):
        for label, entry in self.widgets:
            print("{} = {}".format(label.cget("text"), "=", entry.get()))

if __name__ == "__main__":
    app = App()
    app.mainloop()

You can enter different text on each input and click on the Print info button to verify that each tuple contains the corresponding label and entry.