If you have an adroid device, the only way to get them back are, if they were backed up on gmail.com or saved to the memory card. If they were saved to the memory card, open your contact icon, from there press menu, then export/import, then select import from SD card, then select all v-card files. Taht is only if they were saved to the SD card. On a Blackberry, the only way to get those contacts back are if the device was backed up on a computer. if you have an old device that has your numbers in it then you can take the device into the store for a phonebook swap. I hope this helps you.
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