i just purchased an iPad Mini 2 for my 83 year old mother-in-law. All her friends have smart phones and love to text. She has an old flip phone with w/out a qwerty keyboard, so it's harder for her to text. The iPad has an AT&T cellular connection, in addition to the wifi. Unfortunately, she doesn't have any wifi or Internet service, thus why I bought the cellular iPad. I know the Messages app will allow texts to iPhones, but not all her friends have an iPhone. Is there a 3rd party app that will allow her to text to anyone, with just her iPad and it's cellular connection?