In my experiencing, actually getting text message contents is very difficult. You may SUBPOENAE them, but they're difficult (and slow) to come by. In my sitch, my cell carrier (Nextel)'s stated policy was that they wouldn't even talk to you about it unless you had a CASE NUMBER, so once I DID (after filing for divorce), I sent that case # to their Director of Security, formally requesting the procedure to get the records, and despite three or four attempts, couldn't even get a response back.
However, just the credible threat of being able to get these may be enough to get your husband to cave.
