Okay, I've learned a few things with my 4 kids...so here's the thing…shorten your texts, abbreviate, leave out all the vowels(joking), don't repeat yourself or linger on one thought too long, don't use too many emoticons, don't discuss drama or any negativity or ailments, don't ask nosey questions, and monitor the frequency of advice (best if you wait till they ask you for it but that's hard)…essentially, keep it brief and to the point. When you're finished, edit out all the fluff before hitting "send". Also, don't email them (they don't check there but rather social media, Facebook, Instagram, Twitter, etc)
Plan B….if you are paying their phone bill then you can get your provider to block their phone calls until your texts are responded to first!