When a cordless phone says "Out of Range" or "Searching for Signal", there are a number of possible issues (assuming you are close to the base). 1) The handset battery may be low and not taking a charge. If the battery is more than a year old (including time spent in storage), replace the batteries for both handsets.
2) The base may not have power or an incoming telephone line signal. Check that the power adapter is warm (power to the base). Use another phone cord (and a second phone (preferably corded) to check for a dial tone). If a second phone has no dial tone, see below for diagnosing a phone line.
3) The phone base has lost the registration information for the handsets. A way to reset the phone is to unplug the power cord (from both the wall outlet and the phone base) and the phone data line and unplug the batteries from all handsets. Wait several minutes then plug in the base power and data cords and then reconnect the phone batteries. You may want to re-register the handsets. This is done by putting the handset in the main charging base for 20 seconds when the handset is fully charged. (See your phone manual) The phone was made by Thomson Electronics for GE; the manual is available here: http://www.home-electronics.net/USER-GUIDES/25952_DOM_EN_CL_IB.pdf
4) The phone base or handsets are not transmitting or receiving the signals properly. This means that the phone needs repair or replacement. If it is under warranty, contact the manufacturer. Otherwise decide if the phone is worth the repair costs.
If you have no dial tone at the jack where the base is connected, check another phone jack on that line. If you still have no dial tone, find where the phone service comes in. Then open the service box and if the service is fairly new, plug in the RJ-11 test phone and listen for a dial tone. If you can't plug in the phone cord or there is no dial tone, contact your service provider. They will test and fix any outside problem.
If the problem is inside, inspect the visible wires. If you have a DSL filter as part of the inside wiring, check/replace it. If only one jack has a problem, open the faceplate and fix any loose wires. There are two faceplate designs - screw terminals or keystone jacks. For the screw-type, the conductors must be stripped and secured under the screws. For the keystones, the conductors are not stripped but pressed into the terminals with a punch-down tool. This tool is available at many home improvement stores in the wiring aisle. See http://www.lanshack.com/wire_phone_jack.aspx
for a diagram of the wiring.
If the problem is not in a visible part of your wiring, you may want a professional to find and fix the problem. Your telephone provider will be willing to do the work for a fee.
I hope this helps.