Text and call your phone- Plead, offer a reward, it can't hurt at this stage. You may see your phone again after doing this, but do not count on it.
After texting and calling your phone call your cell phone carrier. Let them know which you have lost you cell phone or it has been stolen. You can ask them to suspend the program of the device, so that the chance of a thief racking up expensive fees on your phone is eliminated.
Use Safety Apps- With clever phones there is an app for helping you look for your stolen phone. There are apps which will track your phone with a GPS tracker. There are also apps which will wipe all the data that is kept on your phone or just lock the phone until you can get to it.
Retrace your steps. This is genuine with anything, and it is genuine with a phone. While there is a high possibility that someone picked it up where you still left it, you may get lucky and find it sitting where it fell out of your purse. It can also help to check your local police station in case a Good Samaritan turned your mobile in. Also get more information related to IMEI Tracker Software and IMEI Locator.
Don't panic. While losing your phone is a very frustrating experience, it is not the end of the world. It will also be difficult to solve the problem if you are freaking out. So take a deep breath, think logically. The worst that can happen is that you will have to buy a new cell phone.
If you are very active on your phone, you may want to consider backing up your phone. This will safe guard your apps, purchases and other valuable data. This way if you do have to buy a new phone, you won't have to start over completely with your new phone.