Ok from reading some website for you. From what I understand is Verizon keeps records of the numbers of texts but only for a limited amount of time. I read but am not fully sure on this but each phone company is supposed to keep a record of this for so much time. I doubt they can tell you what the message said and they will and are allowed to charge you a fee to look these up. And it seems most of time when needing to get past text messages was through court requests etc etc... Such as this...
How do I retrieve text and picture messages after I have deleted them from my wireless phone?
At this time, there is not way to retrieve a text, picture, or video message without a court ordered subpoena. If you do have this document, please contact Verizon Wireless with your request at:
Is there any way to access records of what numbers you've received texts from (preferably quickly; I sometimes accidentally delete texts without reading them; it would be nice to know who sent them)
Log in to your account at MyVerizon - you can see (with about a 24 hour delay) current usage details for calls and text, numbers, dates, time.