Even these two means are no guarantee of obtaining all the text messages on your girlfriend’s phone, as most mobile service providers get rid of texts after a certain amount of time. If the text is recent enough to still be saved on your phone, a cell phone data recovery kit could do the trick.
Cell phone data recovery kit downloads with instructions can be found at www.data-recovery-mobile-phone.com/
In a legal proceeding where text messages might represent significant evidence, the mobile service provider can be forced to hand over the log of intact text messages to the court. However, this is virtually the only legal way to obtain a complete log of text messages, and even this may not be complete thanks to the legal issues involved in a mobile service provider keeping texts forever.
In the United States, AT&T is the provider with the most text message recovery options. Even if the text has long been deleted from your phone, it is still possible to access your account online at www.att.com and search for a log of available text messages.
That being said, other mobile service providers, such as Verizon and T-Mobile, have virtually no options for recovering texts once they have been deleted from a cell phone or smartphone.
In general, if your girlfriend is not aware of you trying to get a copy of all her text messages, the best advice is to not do it, as this constitutes a severe invasion of privacy. The only legit way of going about this is to gain a court order, and if you don’t have one, the text messages are probably not important enough to justify illegal activity.