Can I create a WhatsApp account using my old phone number, which I don't have with me currently? I lost my phone and cannot renew my SIM card due to some difficulties, and many of my contacts have my number, which I don't have access to.

Is there a universal way to change the PIN code on a SIM card for a mobile/cell phone? Will it work both of my phone's two SIM cards, SIM1 and SIM2?

I’m currently experiencing an issue with my Samsung Galaxy A15 4G. After approximately 6 hours of usage, the phone suddenly behaves as if there’s no SIM card inserted. I’ve conducted some tests and found that the same issue persists even when the SIM card is placed in the second slot. This has led me to wonder if the problem could be due to the age of my SIM card, which is nearly 8 years old, or if it’s an issue with the phone itself. **Update:** I tried a different SIM card and still did the same thing. Also, note that the device is rooted, not sure if that can be something. Also, just testing the phone with none rooted AP file. Does anyone have any insights on whether the age of a SIM card could cause such an issue? Any advice or suggestions would be greatly appreciated.

I have been trying to copy my contacts from Google to my SIM card, but nothing happened. How can I transfer my contacts from Google to a SIM card?

I have a Samsung Galaxy GT-I9000 and need to find out my 20 digit SIM number somehow. I have been told that I should go to Settings > General > About to find it. However, it isn't! Does anybody know where this information is stored?

Is there an app out there or would it even be possible to configure Android this way, that a specific task is being executed when a call is received to a specific SIM-card or the other way round: when a specific number is calling? I'm thinking about tasks like rebooting, turning off, or factory resetting the phone. Google's "Find My Device" offers some related features, but as far as I know, they only work when the missing phone is (still) connected to the Internet.

Sometimes I want to access my phone without unlocking the SIM cards (yes, two of them, so two PINs). It may be that I just want to play some games, and I know that there is no coverage so I do not care about missing calls. How can I avoid entering the PIN but being able to unlock the phone itself? Note: removing PIN for normal SIM access is not an option.

I need a phone to use as a wireless monitor for a GoPro camera. The GoPro Quik software only works on Android 9 or later and is only available from Google Play. As far as I know, Google Play only works on Android phones with a working SIM card. Does anyone know, if I buy an UNLOCKED Samsung Galaxy S9 and got a temporary SIM card, could I download the app and would it continue to work after the SIM card expired? This is the only thing I will use the phone for. If you know or have any suggestions please let me know.

How can I add and manage contacts on a SIM card with an Android phone (HTC Magic)? I'm aware of 1 application which is capable of doing this, but it costs 4€ for SIMPLY managing SIM contacts.

I have adb root at Android phone, that Android connect to internet using SIM card through rmnet_data0 interface How can I force change the IPv4 I get in rmnet_data0? When I down the interface and then upload the interface ,the IP stay same.

How to start Android and bypass the SIM PIN? I'm asking myself why it is not possible to start/boot Android without entering the PIN for the SIM card. The smartphone is a computer, with it's own authorization mechanism (device pin, finger print, ...) that I could easily use without access to the SIM and therefore the mobile network. (It is not about the screen lock pin). Why does Android not allow to start without this SIM card PIN and later enter the PIN? (E.g when I looked it up in my password manager in the phone)? I'm using a Google Pixel 4a - Android 13 (not rooted). I've not found a way in the settings about this. Is there any way (removing the SIM is not a real solution)? To add more context / explenation: - The smartphone is protected with the device PIN (or finger print, ...). This is required on "login" after a reboot or to remove the screen lock. - The SIM card is protected with the SIM PIN. This pin is required when the SIM functions are accessed - usually the smartphone keeps its authenticated access to the SIM functions once accessed for the first time as long as it is running. (This is not a permanent unlocking of the SIM, I don't know if this is even possible) - The problem is that on startup/boot of Android is accessing the SIM card forcing to enter the SIM PIN. This can not be skipped. This shall not be needed, as the Smartphone would work fine without the SIM as well (e.g. if physically removed).

I have an Android phone with 2 SIM slots - however, it requires me to select 1 sim for data, and whichever SIM is not being used for data is forced to use 2G. Is there a way I can force the phone to use both SIMs on 4G?

Is it possible to make phone calls from a tablet and use minutes instead of data? The ultimate goal is to have a tablet (e.g. nexus 7) and a Bluetooth headset and make phone calls without using up all my data. I was looking into SIM cards to see if a different kind if card would produce the desired result, but I couldn't get a clear answer.

I woke up one morning to find my mobile (it's pretty beat-up and recently had a professional screen replacement) displaying "No Service". I'm now unable to use mobile internet, make calls or texts. Other connections, WiFi, Bluetooth, etc. are working fine. Here's what I've done so far: - Check that the SIM works > I've visited my network provider and have got a replacement SIM. This has been check that it works in another functional phone. - Checked that the phone detects the SIM > *#06# in the dialer correctly shows the IMEI number and when I go to SIM Manager, it correctly shows my network provider. - Tried to manually select network provider, but when I try to deselected "Select automatically" I get a "Error while searching for networks" message. - Reset mobile network settings > no change. - Factory reset > no change. - Used *#0011# to show SIM info > HPLMN(234-30F) sim_state(0), No Service, Final IMEI Certi: PASS - Used *#9900# → run cp based log → copy to sdcard, then found the *internal storage/log folder/err folder/ss_log folder/MIPI_TEST.txt.* All devices were detected Present(0) - Used the Samsung Members Diagnostic tool to check all hardware - came back all OK. - Disassembled and inspected for loose connections and checked continuity of antenna cables (the white and blue ones). Reassembled and rechecked phone hardware - still "no service". I've been through just about every post on this and tried everything. No idea what to try next. I'm suspecting hardware failure. No idea what to replace. Antenna module? Charging port module? Motherboard? Any ideas?

Does Google Backup save SMS which are stored on the SIM card? I always took for granted the answer is yes, especially because it saves the contacts which are stored on the SIM card, and it doesn't make much sense for a backup utility to miss such important data as SIM sms. However some research revealed that many other SMS backup apps miss these messages, and I couldn't find any explicit info about Google backup.

Does https://play.google.com/store/apps/details/?id=com.huawei.KoBackup (and in particular version 7.1.1.310_OVE from April 2017) which I understand being the official Huawei backup utility, backup SMS which are stored on the SIM card? I always took for granted the answer is yes, especially because it saves the contacts which are stored on the SIM card, and it doesn't make much sense for a backup utility to miss such important data as SIM sms. However some research revealed that many other SMS backup apps miss these messages, and I couldn't find any explicit info about Huawei backup.

I'm using OnePlus 7T with dual SIM. SIM #1 is my default SIM, and SIM #2 is a data SIM which I'm using only for mobile data. Obviously, I've defined SIM #1 to be the default SIM for calls and SMS, and SIM #2 to be the default SIM for data. When I'm in an active call on SIM #1, SIM #2 is automatically blocked. However, instead of using SIM #1 for data, the phone is simply not getting any mobile data at all. Any ideas on tackling this problem? Thanks.

I have a Ulefone Armor 3 on Android 8.1 ([detailed phone info](https://i.sstatic.net/IssYP.png)) . SIM processing error pops up right before shutdown and right after power-up, but only for a second then goes away. The phone seems to work okay. What is this? How do I fix this?

I have a Samsung M33 5G . I use 2 sims . After factory resetting my phone wifi calling works well on both the sims . But soon after the sim 2 stops using wifi calling. My sim 2 is jio 5g sim. Video I tried different methods even aeroplane mode , turning sim on and off ,restarting the phone , also swaping the sim slots of both the phones , it still doesn't work.

For my Sony Xperia xz2 compact I used the LOS builds for years. At June 28th, the GSM stopped working caused by missing sim. 1. I went back to *lineage-21.0-20240621-nightly-xz2c* 2. I ordered a new SIM card from my provider -> not detected 3. I took another xz2c device -> same phenomenon 4. I tried *lineage-21.0-20240706-nightly-xz2c* and *lineage-21.0-20240712-nightly-xz2c* -> still SIM not detected 5. SONY Xperia z3c (with outdated LOS) and iPhone 11 -> SIM detected 6. Installed /e/OS on xz2c -> SIM not detected To sum up: SIM seems to be okay. Two devices of the same type with different Android-bases OSs cannot detect (more than one) SIM Card. I doubt an identical hardware crash in two independent devices at the same time. Any ideas for further investigations? Any chance that there is a systematic bug in the current android-based builds? Any similar experiences with xz2c?