As phones have become more advanced, most mobiles have native storage space, either in the form of memory cards, mass memory or phone memory. Subject to brands and models, each phone in the market today has some combination of the above. However, before memory came into the picture, SIM cards stored contact and message data. So in the case of transferring messages, it is possible to store the messages onto the SIM, replace the SIM in the new phone, and transfer back into the inbox. Text messages have timestamps, so the timeline won’t be lost. This is a particularly useful method if both the phones are from different manufacturers.