I have Karbonn A9, Android 2.3.6. The GPRS/Data does not switch on occasionally, but once I reboot the phone I can start it. After deactivating GPRS/Data I have to reboot the phone get either data or GPRS to connect again. What could be causing this?

[In Android's source code, I see](https://android.googlesource.com/platform/hardware/ril/+/master/include/telephony/ril.h) typedef enum { PREF_NET_TYPE_GSM_WCDMA = 0, /* GSM/WCDMA (WCDMA preferred) */ PREF_NET_TYPE_GSM_ONLY = 1, /* GSM only */ PREF_NET_TYPE_WCDMA = 2, /* WCDMA */ PREF_NET_TYPE_GSM_WCDMA_AUTO = 3, /* GSM/WCDMA (auto mode, according to PRL) */ PREF_NET_TYPE_CDMA_EVDO_AUTO = 4, /* CDMA and EvDo (auto mode, according to PRL) */ PREF_NET_TYPE_CDMA_ONLY = 5, /* CDMA only */ PREF_NET_TYPE_EVDO_ONLY = 6, /* EvDo only */ PREF_NET_TYPE_GSM_WCDMA_CDMA_EVDO_AUTO = 7, /* GSM/WCDMA, CDMA, and EvDo (auto mode, according to PRL) */ PREF_NET_TYPE_LTE_CDMA_EVDO = 8, /* LTE, CDMA and EvDo */ PREF_NET_TYPE_LTE_GSM_WCDMA = 9, /* LTE, GSM/WCDMA */ PREF_NET_TYPE_LTE_CMDA_EVDO_GSM_WCDMA = 10, /* LTE, CDMA, EvDo, GSM/WCDMA */ PREF_NET_TYPE_LTE_ONLY = 11, /* LTE only */ PREF_NET_TYPE_LTE_WCDMA = 12, /* LTE/WCDMA */ PREF_NET_TYPE_TD_SCDMA_ONLY = 13, /* TD-SCDMA only */ PREF_NET_TYPE_TD_SCDMA_WCDMA = 14, /* TD-SCDMA and WCDMA */ PREF_NET_TYPE_TD_SCDMA_LTE = 15, /* TD-SCDMA and LTE */ PREF_NET_TYPE_TD_SCDMA_GSM = 16, /* TD-SCDMA and GSM */ PREF_NET_TYPE_TD_SCDMA_GSM_LTE = 17, /* TD-SCDMA,GSM and LTE */ PREF_NET_TYPE_TD_SCDMA_GSM_WCDMA = 18, /* TD-SCDMA, GSM/WCDMA */ PREF_NET_TYPE_TD_SCDMA_WCDMA_LTE = 19, /* TD-SCDMA, WCDMA and LTE */ PREF_NET_TYPE_TD_SCDMA_GSM_WCDMA_LTE = 20, /* TD-SCDMA, GSM/WCDMA and LTE */ PREF_NET_TYPE_TD_SCDMA_GSM_WCDMA_CDMA_EVDO_AUTO = 21, /* TD-SCDMA, GSM/WCDMA, CDMA and EvDo */ PREF_NET_TYPE_TD_SCDMA_LTE_CDMA_EVDO_GSM_WCDMA = 22 /* TD-SCDMA, LTE, CDMA, EvDo GSM/WCDMA */ } RIL_PreferredNetworkType; The problem is, I don't know what the terminology maps to. "LTE" is obviously just 4G LTE, but what are TD-SCDMA, WCDMA, and EvDo? I'm assuming at least some of them must map to 2G (GPRS), 2G (EDGE), 3G, "3.9G" (HSPA+), but which is which? And which ones are actually CDMA (Sprint, Verizon, etc.) rather than GSM? (I'm a little confused because it seems GSM LTE phones also have modes like WCDMA?)

I start a google hangouts call and I'm connected to wifi. Then when I leave home, the call is handed over from wifi to GPRS. How is this done? Does the app help doing the handover or is this transparent to the app? When switching to GPRS, the phone gets a new ip address, so a new connection is necessary, right?

My android 2.3 phone is connecting to the internet using the GPRS network and I get a new IP everytime I reconnect. So now I try to connect to my phone which is connected to the internet - the internet is working on the phone because I can use the browser. I also installed a FTP server and enabled to allow all connections. Unfortunately I can't get even a ping. It all works when I connect the phone to WIFI (and use the local IP) So is it just me or is it not possible to connect to GPRS connected phones?

If you search the net, you come across with ranges like these that claim would enhance your net throughput: net.tcp.buffersize.default=4096,87380,256960,4096, 16384,256960 net.tcp.buffersize.wifi=4096,87380,256960,4096,163 84,256960 net.tcp.buffersize.umts=4096,87380,256960,4096,163 84,256960 net.tcp.buffersize.gprs=4096,87380,256960,4096,163 84,256960 net.tcp.buffersize.edge=4096,87380,256960,4096,163 84,256960 In place that I live, the net speed of gprs/edge connectivity is so slow that even sending just a sentence of text via instant messaging apps like Whatsapp could take up to 5 seconds and even fails to send some times! but on the other hand my wifi connectivity is very fast; so; what range of tcp net buffer size do you recommend for these two connections that better suits me?(or maybe any other effective variable)

With my Galaxy 5, I can visit websites using wifi, but how can I access them using GPRS (=when no wifi around)? I don't want to pay for a 3G data plan with my mobile operator. **Background**: On my old Nokia phone (which didn't have wifi), I was able to visit a website using GPRS (useful only for emergencies, but still, useful). This meant that I did not have to subscribe to some data plan with my mobile operator (at least in my country this is so); I did have to pay for the GPRS connection, but that was only when connected.

My mother in laws phone continuously downloads from GPRS, seemingly even when wifi is available. Usually the downloads are very small and in multiples over a short period. occasionally they are much larger, up to 50MB. The records from the provider indicate that some of these downloads are from Facebook and youtube, however she has not used these apps or logged in. The downloads are occurring so often that she is getting warnings that she will exceed her quota (200MB/month). She has set apps so they don't update automatically. Also she syncs three gmail accounts to the phone. Does anyone know what these frequent downloads may be, and also if it is possible to limit them to only when wifi is available. Thanks

Samsung Galaxy 3 5801 phone with android 2.1 OS. When I enable GPRS I am getting dropped calls and weak signal. When I disable GPRS I find my calls don't drop and the signal much better. Is it a hardware issue or service provider issue or a software issue? How can I fix it?

I have a Nexus S and a GPRS plan activated, from what customer services of my mobile carrier have told me is that GPRS will give you max of 10-15 kB/s download speed. In my Nexus S if i don't select "Use Only 2G" in "mobile network" setting i get speeds up to 80kB/S and the symbol in the status bar shows 3G symbol. As soon as i select the "Use only 2G Network" my download speed drops to 10 kB/s. I have used spedtest application to check speed. I have verified with my Mobile carrier and i do not have any 3G plan activated. How is this Possible, i don't want to get any kind of shock when i receive my Mobile bill :) Edit : My mistake, corrected capitalizations.

As title. Of course using Android market and the Google Checkout payment. By the way, how about other market-like apps?

Is it possible to use VoIP over gprs from an Android phone? Either using a SIP client or Skype?

> **Possible Duplicate:** > [How to share internet among 2 android devices?](https://android.stackexchange.com/questions/4117/how-to-share-internet-among-2-android-devices) > [Can we use an Android phone as a Wi-Fi repeater?](https://android.stackexchange.com/questions/12616/can-we-use-an-android-phone-as-a-wi-fi-repeater) I have an android cell phone (Samsung Galaxy S Advance) running on Android 2.3.6. I am interested in converting my cell phone to a WiFi-Hotspot so that I can use the GPPRS/3G from my phone to access internet on other WiFi-enabled devices. Any android applications that might help to do this?

Is it possible to change the android equivalent of sun.net.client.defaultconnecttimeout? Many applications are not working correctly over an high latency edge connection, but work with H+ or WiFi. So maybe increasing the timeout globally could help. Is that possible?

I have a Spice Mi-270 Android phone. There is no touch gadget to enable or disable the GPRS connection. Every time I have to select settings -> wireless & networks -> data communication sim and have to select a SIM to turn GPRS off. How can I do this in one touch?