Can you use it for your cell phone? - Mad Catz PS3 Bluetooth® Headset Wireless Headset

I'm assuming that your cell phone works fine.

Your cell phone gets its signals from cell towers serving your cell phone service provider, e.g. Sprint, AT&T, Verizon, T-Mobile.

If you are in a building or elevator, your signal can be weak. Try going to the edge / side / top of a building, like by a glass window to see if the signal is stronger.
Or if your cell phone service provider (phone company) doesn't have a cell tower close to where you are, the signal can be weak or nil.
You can find out your cell phone company's cell tower coverage areas ...by checking their website. If you are at locations where your cell phone service provider has good coverage, you will get stronger signals. Otherwise, expect to get weak signals.
Yes, it's always prudent to check which cell phone service provider has good cell (tower) coverage in areas where you are (using your cell phone) most of the time, and subscribe to that company's cell phone service.

If your mobile phone is lost or stolen you can inform your cell phone provider with your IMEI number. Your cell phone provider can then put the serial number on a shared database. This list stops this particular phone from registering on any network and will be useless for anyone even if the mobile phone's SIM card is changed. It is not possible to trace your cell phone, even if you had setup a tracker program on the phone, it can only give the location of your cell phone in the coverage area where the cell phone transmitter tower is located.
Your best bet is to ring your cell phone and hope the person who answers your cell phone will return your phone to you.
Otherwise I suggest you contact your cell phone provider ASAP. To lock/block your cell phone from further use, please click on this link :- http://www.fixya.com/support/r5057854-lost_or_stolen_cell_phone

If your mobile phone is lost or stolen you can inform your cell phone provider with your IMEI number. Your cell phone provider can then put the serial number on a shared database. This list stops this particular phone from registering on any network and will be useless for anyone even if the mobile phone's SIM card is changed. It is not possible to trace your cell phone, even if you had setup a tracker program on the phone, it can only give the location of your cell phone in the coverage area where the cell phone transmitter tower is located.
Your best bet is to ring your cell phone and hope the person who answers your cell phone will return your phone to you.
Otherwise I suggest you contact your cell phone provider ASAP. To lock/block your cell phone from further use, please click on this link :- http://www.fixya.com/support/r5057854-lost_or_stolen_cell_phone

A mobile phone jammer is an instrument used to prevent cellular phones from receiving signals from base stations. When used, the jammer effectively disables cellular phones. These devices can be used in practically any location, but are found primarily in places where a phone call would be particularly disruptive because silence is expected. A cell phone signal jammer is used to stop nearby cell phones from sending or receiving signals to and from the cell phone tower. A cell phone works by communicating with its service network through a cell tower or base station. Cell towers divide a city into small areas, or cells. As a cell-phone user drives down the street, the signal is handed from tower to tower.

Cell phone jammers block cell phone use by sending out radio waves along the same frequencies that cellular phones use. This causes enough interference with the communication between cell phones and towers to render the phones unusable. On most retail phones, the network would simply appear out of range. Most cell phones use different bands to send and receive communications from towers. Jammers can work by either disrupting phone to tower frequencies or tower to phone frequencies or both.

Cell phones are full-duplex devices, which means they use two separate frequencies, one for talking and one for listening simultaneously. Some jammers block only one of the frequencies used by cell phones, which has the effect of blocking both. The phone is tricked into thinking there is no service because it can receive only one of the frequencies. The jammer also stops Internet use through Wi-Fi network and even blocks Bluetooth connections. The cell phone signal jammer also puts an end to text messaging, so students cannot SMS each other, while the teacher is trying to teach.

Interestingly, jammers are life saving devices for military. Terrorists use cell phones to trigger explosives. Army can use a jammer to make mobile phones go dead, so that army technicians can deactivate the bomb.

If your mobile phoneis lost or stolen you can inform your cell phone provider with your IMEInumber. Your cell phone provider can then put the serial number on a shareddatabase. This list stops this particular phone from registering on any networkand will be useless for anyone even if the mobile phone's SIM cardis changed.It is not possible to trace your cell phone, even if you hadsetup a tracker program on the phone, it can only give the location of yourcell phone in the coverage area where the cell phone transmitter tower islocated.
Your best bet is to ring your cell phone and hope the person who answers yourcell phone will return your phone to you.Otherwise I suggest you contact your cell phone providerASAP. To lock/block your cell phone from further use, please clickon this link :-http://www.fixya.com/support/r5057854-lost_or_stolen_cell_phone

There is no such thing as a free cell useage anywhere abroad.
You can contact you cell phone service provider and enable ROAMING on your cell phone to the country you need.
Otherwise
You can purchase a prepaid SIM card in the country you are visiting and use it in your cell phone.
NOTE Your cell phone must be an unlocked cell phone. If your cell phone is locked to your cell phone service provider then, you can arrange for a restriction unlock code from your cell phone service provider and advise them that you wish to us an overseas prepaid SIM card in your cell phone when you are travelling overseas.

Your best bet is to ring your cell phone and hope the personwho answers your cell phone will return your phone to you. If your cell phone is GPS enabled then it is possible totrack, but you need to contact your cell phone service provider. Otherwise I suggest you contact your cell phone providerASAP. To lock/block your cell phone from further use, please click on this link:- http://www.fixya.com/support/r5057854-lost_or_stolen_cell_phone

Your best bet is to ring your cell phone and hope the personwho answers your cell phone will return your phone to you. If your cell phone is GPS enabled then it is possible totrack, but you need to contact your cell phone service provider. Otherwise I suggest you contact your cell phone providerASAP. To lock/block your cell phone from further use, please click on this link:- http://www.fixya.com/support/r5057854-lost_or_stolen_cell_phone

It is not possible to trace your cell phone, even if you hadsetup a tracker program on the phone, it can only give the location of yourcell phone in the coverage area where the cell phone transmitter tower islocated.
Your best bet is to ring your cell phone and hope the person who answers yourcell phone will return your phone to you. Otherwise I suggest you contact your cell phone providerASAP. To lock your cell phone from further use, please click on this link :- http://www.fixya.com/support/r5057854-lost_or_stolen_cell_phone

i know ALOT of cheats for grand theif auto 4 for the 360 here they are :

Full health and armor Dial "3625550100" on the cell phone. If you enter this code while in a vehicle, it will also repair it. Note: This phone number translates to "DOC-555-0100". This code prevents the "Cleaned The Mean Streets", "Finish Him", "One Man Army", and "Walk Free" achievements from being earned.
Full health, armor, and ammunition Dial "4825550100" on the cell phone. If you enter this code while in a vehicle, it will also repair it. Note: This phone number translates to "GTA-555-0100". This code prevents the "Cleaned The Mean Streets" achievement from being earned.
Weapons tier 1 Dial "4865550100" on the cell phone. This will unlock the baseball bat, handgun, shotgun, MP5, M4, sniper rifle, RPG, and grenades. Note: This phone number translates to "GUN-555-0150". This code prevents the "Cleaned The Mean Streets" achievement from being earned.
Weapons tier 2 Dial "4865550150" on the cell phone. This will unlock the knife, Molotov cocktails, handgun, shotgun, Uzi, AK47, sniper rifle, and RPG. Note: This phone number translates to "GUN-555-0100". This code prevents the "Cleaned The Mean Streets" achievement from being earned.
Remove Niko's wanted level Dial "2675550100" on the cell phone. Note: This phone number translates to "COP-555-0100". This code prevents the "One Man Army" and "Walk Free" achievements from being earned.
Add one star to Niko's wanted level Dial "2675550150" on the cell phone. Note: This phone number translates to "COP-555-0150".
Spawn Annihilator police helicopter Dial "3595550100" on the cell phone. The Annihilator is armed with rockets. Note: This phone number translates to "FLY-555-0100". This code prevents the "One Man Army" and "Walk Free" achievements from being earned.
Spawn Cognoscenti Dial "2275550142" on the cell phone. Note: This phone number translates to "CAR-555-0142".
Spawn Comet Dial "2275550175" on the cell phone. Note: This phone number translates to "CAR-555-0175".
Spawn FBI Buffalo Dial "2275550100" on the cell phone. Note: This phone number translates to "CAR-555-0100".
Spawn Jetmax Dial "9385550100" on the cell phone. Note: This phone number translates to "WET-555-0100".
Spawn NRG-900 Dial "6255550100" on the cell phone. Note: This phone number translates to "MBK-555-0100".
Spawn Sanchez Dial "6255550150" on the cell phone. Note: This phone number translates to "MBK-555-0150".
Spawn SuperGT Dial "2275550168" on the cell phone. Note: This phone number translates to "CAR-555-0168".
Spawn Turismo Dial "2275550147" on the cell phone. Note: This phone number translates to "CAR-555-0147".
Change weather and brightness Dial "4685550100" on the cell phone. Note: This phone number translates to "HOT-555-0100".

The following codes require "The Lost And Damned" bonus downloadable content:

Spawn Burrito Dial "8265550150" on the cell phone.
Spawn Double T bike Dial "2455550125" on the cell phone.
Spawn Hakuchou bike Dial "2455550199" on the cell phone.
Spawn Hexer bike Dial "2455550150" on the cell phone.
Spawn Innovation bike Dial "2455550100" on the cell phone.
Spawn Slamvan Dial "8265550100" on the cell phone.