When i open my phone it always says that insert sim even if there is a sim

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

your sim card ic is damaged, so your phone cant read your sim card module.
bring your phone to your nearest repair shop so it can repaired.

It seems that the Sim Card is not inserted properly or the Phone does not support the Network in which the Sim Card works. Try using different Sim Cards and make sure you have tried 2G and 3G Sim Cards. Some Phone models are Country specific means they work only to particular Network like CDMA.

there is a problem in ur SIM card . Not in ur phone.

hi it most likely that the sim has been over used may be like removing it times without numbers. the best bet is to go to the operator and request for another sim. so that it fits perfectly

My phone always display No service but I insert my sim to another phone it is working fine. How can fix this problem?

clean area where sim goes and clean sim card see if that helps also try pushing on sim when its in phone with cover off may be lose

Solution, try putting a paper behind the sim card before placing it in the cellphone. The paper adds thickness to the sim card and makes it touch the connectors in the cellphone.

Try to insert the sim the correct way around.

Sounds like phone is locked or firmware is bad