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If you are on the go, then one of the most easiest way to stay in touch with your friends is by texting or Short Messaging Service (SMS). However, with so many text messages, it is hard to keep track of your messages. Treasuremytext helps you to organize your personal SMS archive online. With unlimited storage space, Treasuremytext is an online SMS Storage service where you can save your messages and it appears instantly in your Inbox. It’ll never be lost or accidentally deleted when you change or upgrade phones.
With Treasuremytext, you can also organize your messages with just drag and drop your messages into separate folders. Built in is your own contacts list with buddy pictures so you’ll know exactly who said what and when. The web is all about sharing and now your SMS are part of it. Share your real life in real time in a TextStream with friends and others. If you prefer to keep things private you can also choose to share nothing or only the ones you want to.
How does it work?
You forward SMS messages by SMS to a standard mobile number in either USA and Canada, The United Kingdom or The Netherlands. Just pick the one for your country or wherever it is cheapest to SMS to. Check with your network operators about charges. Once you’ve signed up for an account, when you login all your messages will be there.

Seems this is what I need. I keep all SMS from my husband before we married. Now, I feel annoying because my phone memory almost full but I don’t want to delete those. Thanks for the info.
O2 in the UK have recently started promoting a similar service called BlueBook, which lets you store all of your incoming SMS on their servers automatically and you can access them via their website.
Obviously only works if you’re a customer of theirs and you have to sign up to use it. Allows you to sync your address book too.