python andoid sms sender

import androidhelper, time

tim = androidhelper.Android()

def sendText(number, msg, frequency, delay):
    for n in range(0, frequency):
        tim.smsSend(number, msg)
        time.sleep(delay)
    menu()

def addNumber():
    newNumber = input('enter new number > ')

    while True:
        choice = input('are you sure you want to save this number? > ')
        if choice == 'y' or choice == 'Y' or choice == 'yes' or choice == 'Yes':
            numbersFile = open('/storage/sdcard0/numbers.txt','a')
            numbersFile.write('\n' + newNumber)
            numbersFile.close()
            break
        elif choice == 'n' or choice == 'N' or choice == 'no' or choice == 'No':
            break
    menu()

def menu():
    print('1) send msg\n2) add number')
    while True:
        choice = input('> ')
        if choice == '1':
            numbersFile = open('/storage/sdcard0/numbers.txt','r')
            number = numbersFile.readlines()
            numbersFile.close()

            for line in enumerate(number): print(str(line[0] + 1) + ') ' + line[1].split('\n')[0])

            while True:
                numberChoice = int(input('what number will this be sent to? > ')) - 1
                if numberChoice < len(number) or numberChoice <= 0: break

            number = number[numberChoice]

            msg = input('what message would you like to send? > ')
            frequency = int(input('how many times would you like to send this message? > '))
            delay = int(input('delay between messages? > '))
            sendText(number, msg, frequency, delay)
        elif choice == '2': addNumber()
        else:
            continue
        break

menu()