Objective-c – get carrier name and signal strength return wrong value in iphone

Apple does not allow developers direct access to the low-level wireless API functions. It is possible to include some of these functions in your application (see the iphone-wireless project for example) but your application will not be accepted for inclusion in the iTunes store.

Previously some applications were allowed to do this (WiFiFoFum for example) but these applications have been removed from the store for using private APIs.

Warning : this solution should work for Android below API17. Some people may have troubles with newer api or specific phone brand (like Huawei)

You need to use this code. In fact, all the information you need is here :

String ssignal = signalStrength.toString();

String[] parts = ssignal.split(" ");

The parts[] array will then contain these elements:

part[0] = "Signalstrength:"  _ignore this, it's just the title_

parts[1] = GsmSignalStrength

parts[2] = GsmBitErrorRate

parts[3] = CdmaDbm

parts[4] = CdmaEcio

parts[5] = EvdoDbm

parts[6] = EvdoEcio

parts[7] = EvdoSnr

parts[8] = LteSignalStrength

parts[9] = LteRsrp

parts[10] = LteRsrq

parts[11] = LteRssnr

parts[12] = LteCqi

parts[13] = gsm|lte|cdma

parts[14] = _not really sure what this number is_

So, LTEdBm is :

TelephonyManager tm = (TelephonyManager)context.getSystemService(Context.TELEPHONY_SERVICE);

int dbm = 0;

if ( tm.getNetworkType() == TelephonyManager.NETWORK_TYPE_LTE){

    // For Lte SignalStrength: dbm = ASU - 140.
    dbm = Integer.parseInt(parts[8])-140;

}
else{

    // For GSM Signal Strength: dbm =  (2*ASU)-113.
    if (signalStrength.getGsmSignalStrength() != 99) {
                    int intdbm = -113 + 2
                            * signalStrength.getGsmSignalStrength();
                    dbm = Integer.toString(intdbm);
                }
}

bye