No network k790i , not SIM problem

First of all make sure the SIM card is active and you have network signals, secondly try to find out if the fone is kept in offline mode or airplane mode.

If you find everything proper, try to insert the sim in another device and make sure the SIM is working correctly

try this one u must

2730c no signal done for references
history wet!
1st clean fone
same problem
2nd software fone
same no network
3rd remove cover and reheat alog this ic

then clean and test
result



thanks *** gudluck ^_^
gud day

Try to keep the following two steps when you get this type of error.
1.Check whether it's your sim card is properly inserted or not
2.Your mobile is restricted by some network.So try to unlock it.
If it's network locked means try to unlock your HTC Salsa mobile phone using Unlocking4u.com Here you can unlocks your mobile at low cost.

First:


First All Check:
1.Confirm whether same sim card is working in other h.s or not.
2.Make sure the sim slot is o.k. only try these two.
3.If all the above steps fails, check the SIM card connector pins for damage.
if so try to get serviced.
4.if ur sim card is good then it is problum form sim card ic u have u raplace it with SMD.
u can make it jumper mean u can fix this prob with out sim card is for this contact.
5.take sim connector slight up by pin then cheak by inserting sim.
6.hot air gun on sim i.c. then cheak it.
Last Option:
IF make sure that the sim card hasn't been damamged at all sO Please You Go to Service
& Sim Office and Get the Duplicate Sim Same Your No From Office Oprator
Problem will Solved Quickly


Second:


First Option:
Phone in the Other Sim and check the Phone Network Signal If Network Signal Problem not Solved So
Secend Option:
Your Phone Network IC Fault So Please change Network IC
And Network Signal Problem will Solved
if it is there isn't much you can do on this side of the network.
Contact your phone company.

Dear, change ur sim card and then try to turn on,if it does'nt work then it means that the software of ur fone is corrupt u should go to a certified mobile fone repairer and get flashed ur mobile..

Hi There,

There are two possible reasons why this is not working.

1). The SIM card that you are using is no longer valid in the system of your mobile provider.

2). Your fone is faulty and does not make contact or recognise your SIM card whether or not it is inserted into the fone.

u can buy this part from markettill then u can switch on ur phn with needle typ thing

hi im josh in cebu phils. may i help you? As a mobile phone techinician, Friend i will say that the problem centers on your phone and not on the sim card.
You phone is locked to the network of that SIM or commonly mentioned "not open line" thats why the software or the phone doesn't recognizes the SIM you are using because it is locked. To solve this problem you may go to your network provider and ask for assistance of opening the line of your phone so that you can use any sim cards you wanted. and your phone will now be unlock or "openline".Thats all friend hope i helped you good luck

Sounds like the phone hasn't been unlocked properly. I had a similar problem and eventually just changed my sim to the original phones network. This solved all problems but i don't know wether this is the full solution to your issue. I tried to help best as though dude.
Cheers.

- I switch off my k790 and changed a sim card but could not turn it on. Whonever I press the power on button a red light flashes near the infrared port.The same problem occurred whenever I inserted the data cable and my computer does recognised my phone.-