how we can do free cell phone number search??

i had lost a phone and thus its contacts and i understand what it feels like. i even lost my dad's phone lost contacts so i have BEEN THERE DONE THAT. but now we have cell phone number search softwares, so if you lose your mobile phone or if it gets stolen, you can use following tips to retrieve your contacts. There are three possibilities that can help you with the aim. For phones operating without SIM cards, you cannot get your contacts back. This is why it’s important to regularly make backups of the data contained in your cell phone on your computer. For phones operating with SIM cards: if you subscribe to a SIM save option, your mobile operator will be able to resend the data back to you. Of course, this will only work if your phone directory is saved on your SIM card. Some mobile operators offer this option but it isn’t the case for all of them. secondly, if you regularly BACKUP your phone contacts on the computer with any kind of communication software before you lose your phone, you can easily restore your contacts to your new phone – just connect your phone to your computer and use software for Mobile – Computer synchronization (delivered with any modern phone).