Some times the phone signal freezes (it shows some lines of signal but you cannot receive or make calls). I usually turn it off and on again and it starts to work but sometimes it is not turning off, although I uncheck it, it stays "connected". In those cases I need to restart the phone (using left alt+right shift+ del). Just in case it is important, usually it shows an error after restarting saying somethin like "uncough exception >= 8". Don't hesitate in contact me if any doubt.

usually people remove the battery and put it back in straightaway or after a minute or so, this only restarts the phone, after 5mins or more, the phone will rebbot the ram as its restarting, maybe you have tried this already, if you have then you need to get intouch with blackberry, as it is probebly a faulty arial, and this falls under blackberry customer garuantee, so they should repair it for you (they may charge for repairs, but it falls under the "faulty handset" catergory, so should fix for free)

if still no joy, or if blackberry refuse to fix it, then if not allready insured, insure it an accidently drop it, hence insurance will give you a new phone!!

good luck! usually people remove the battery and put it back in straightaway or after a minute or so, this only restarts the phone, after 5mins or more, the phone will rebbot the ram as its restarting, maybe you have tried this already, if you have then you need to get intouch with blackberry, as it is probebly a faulty arial, and this falls under blackberry customer garuantee, so they should repair it for you (they may charge for repairs, but it falls under the "faulty handset" catergory, so should fix for free) if still no joy, or if blackberry refuse to fix it, then if not allready insured, insure it an accidently drop it, hence insurance will give you a new phone!! good luck!