1. Whenever I try to make a call it shows "no network coverage".There is no reception of calls also.
2. Display of Towers at the left side of the phone is not to be seen.
3. I checked SIM, it is working perfectly when put in other cell phones
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Unlocked refers to removing software that keeps a phon e"locked" to a specific service provider. Sounds like the phone you have is on a carrier that has poor coverage in your area. I would suggest contacting the provider of your phone to see if they can either 1) update the phones info so it can access other towers (for example - just because it is on Verizon doesn't Mena it is programmed to access all towers as towers are used by contract and towers are often updated) 2) provide you with a phone that is on a different carrier that has better coverage in your area.
Emergency calls only is a symptom where a cellphone loses its registration to a valid network operator. It usually happens to me when I am in another country and the cellphone cannot locate valid operators. Looks like some telcos choose particular network partners. What I do is choose the network operator manually in the phone's setting.
If you are in your home country and this happens, it only tells you that you are out of coverage area and the phone is losing connection to your network operator. Maybe you are inside a building with thick walls which cause poor reception. You may try choosng an area where the symptom goes out.
Valleys close to wireless towers usually cause call drops. Wireless carriers are always competing for coverage areas and improvements in reception. Switching carriers or buying prepaid emergency phones for dropped call areas is helpful.
Have you tried going into your Mobile Networks and Network Operators settings? In the Mobile Networks settings, you should find "Network Mode". Check to make sure that is in "GSM/WCDMA (auto mode)" If that doesn't work, try clicking the "Network Operators" in the same settings group and then hit "Search networks".
This usually indicates that your Mobile phone provider does not have a network coverage in your area (note: in Country areas, limited network coverage is usually from Vodafone, 3 or Optus). To be on the safe side, make sure that you allow both 2G and 3G network access as 3G access is usually limited to larger cities/towns.
Check with your Mobile phone provider for both 2G and 3G coverage in your area.
Emergency calls are allowed from any Network even if your provider does not service a specific area.
Keep in mind, poor reception is
not something that your service provider will fix just because you want
them to. It must be justifiably cost effective for them to put up new
towers, which will ultimately be criticized by cities, home owners
associations, etc. Most users think there is nothing they can do to
improve their cell phone reception by themselves. This is most
certainly untrue, and the following will explain what you can do to
ensure great mobile coverage without waiting for a new tower to
Your cell phone uses a lot more power when connecting a call than when
it is on standby. Often, your battery can be strong enough to attempt a
call, but not strong enough to find a signal. If you find you are
having signal problems, try to keep your battery charged to 2 bars or
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Buildings and other large structures are very unfriendly to cell phone
signal. Rather than making calls from deep inside buildings try moving
outside or to a window to place your call. If you are having reception
problems on the street try walking to the nearest intersection as they
typically have better coverage. Cellular band radio waves do not
effectively penetrate earth: if you are underground you will likely
receive no signal.
3Install a cellular repeater.
If you are having cell problems in one location, such as your home or
office, then try installing a cellular repeater. Cell phone repeaters
pick up low cell signal with an antenna, boost the signal and broadcast
it over the coverage area. They typically need at least 2 bars of
signal where the antenna is placed (usually outside or on the roof) but
can substantially improve cell reception, as well as battery life and
data download speeds. Some repeaters might need technical knowledge
such as the frequency of your carrier, and only work for one service
provider. For a less technical approach that improves reception on all
carriers, use a dual-band cell phone repeater.
4Upgrade your antenna.
A few cell phone manufacturers make a "Hi-gain" antenna for their
handsets, which may be changed in-store or by the user at home.
Although these won’t improve signal as much (or at all) as a repeater
these antennas are relatively inexpensive and you are not confined to
Most networks operate independently of one another, using their own
frequencies and constructing their own cell phone towers. Chances are
if the signal is bad with one network you can improve by switching.
Most cellular networks these days allow you to transfer your phone
number when you change provider.
6Hold your phone correctly.
Mobile phone antennas are designed to project a signal outward,
perpendicular to the long axis of the antenna. As such, mobile phones
seek signals in a donut-esque shape around the antenna. Normally, when
a mobile is held upright, this is not a problem. However, if you are
holding your phone in a strange way, such as on its side or upside
down, you will hinder the operation of the antenna. Hold your phone
upright to guarantee that your phone can "see" your carrier signal.
7Host a cell site.
This may take time, but where cell phone reception is inadequate
property owners can host small cell sites on their properties for major
wireless carriers. 3rd parties with Wireless Revenue Programs allow you
to register your property to be eligible. Then when there is carrier
interest in the area you'll be on the short list of places they choose
from and will have optimal coverage. They may even pay your phone bill.
You may not have coverage in your area unless your roaming, call your cellphone carrier and ask if you have service at the location! if you do you may have an issue on your carriers end, call tech support and ask whats going on. If you can make calls whilst roaming, there should be no reason you can't when on your normal carrier.