ipad3, failed to activate cellular data network, PDP authentication failed, 20

Here's how to solve it:

1. Turn on "Data Roaming", and you may be able to use a cellular data network from another carrier if it is not within the coverage area of the carrier's network. In Settings, tap Cellular Data and turn on Data Roaming.

2. Create a cellular data plan (3G Internet settings) on your iPad, and in "Settings", click "Cellular Data - APN Settings". If it is a 3G card of China Unicom, fill in "3Gnet" in the APN; If it is a China Mobile card, fill in "CMNET" in the APN, and China Mobile's card only supports GPRS and EDGE.

4. Monitor the used traffic of the cellular data network, and in "Settings", click U General - Elapsed Time. In the "cellular network data" can be displayed "send" and "receive" data meteors, for users who pay monthly meteors, this statistic is still very useful, when the "receiving" meteors are close to the upper limit of the monthly meteors, you can use less ipad to surf the Internet, so as not to incur high Internet fees.

5. Click "Restore Statistics" to clear the meteor statistics, and users who subscribe to the Internet should remember to clear it once on the 1st of each month.

Hello! Check if you are in arrears, and this is the case with mine. After getting it for most of the day, it's OK to recharge in the end.

When in doubt, please ask.

Which data card do you use? Rule it out for yourself. Check the phone bill first, or take out your card and try it on another device, or try it on your iPad with other cards that can access the Internet, and you will try it out. I'm in a hurry, you're watching movies by yourself and overseeing the traffic, and there is no money on the card.

I also encountered the same problem as you today, and it hasn't been solved yet, and in my depression, I saw someone say that the traffic has run out, have you tried to change the card. I don't have any other cards here that I can't try.

So what method did you use to solve it in the end? I'm having the same issue now. Thank you!

PDP authentication for cellular data networks cannot be activated. Network recovery can be performed by restoring network settings.

1. First find the software button of the settings in the menu interface of the mobile phone, and click to enter.

2. Then after entering the settings page, find the general options in the menu bar that appears, and click enter.

3. Then after entering the general menu, in the menu that appears in the mobile phone interface, find the option to return the pants to the plateau, and click.

4. Then enter the restore menu, find the reset network settings menu option button on the interface of the phone, and then click Select to enter.

5. Finally, after the restoration is completed, return to select the cellular mobile network and restart the cellular mobile data, which can solve the problem of failed to activate the PDP identification of the cellular mobile data network.

Reason: If the previous ** is 2G, according to the rules of China Unicom, when the monthly traffic reaches 6G, it will be capped, and there will be "Failed to activate cellular data."

PDP Authentication Failed".

Solution: Call China Unicom customer service 10010, cancel the traffic cap through manual service, and restore the Internet function after restarting the mobile phone.

Expand your knowledge: Cellular data, that is, from data transmission to exchange, adopts packet technology, and the user is equipped with a wireless packet modem.

Entering the packet network through a dedicated packet base station can access the host and database on the packet network, and can also call another mobile data terminal. This technique is mainly used by specialized mobile data communication slow attack banquet information systems, which can only provide mobile data users with a connection to packet-switched data network users.

Cellular Digital Packet Data (CDPD) is a mobile packet data technology used on the spectrum of cellular** networks such as AMPS. CDPD is characterized by the ability to utilize any free channel in the cell through channel hopping without affecting the voice traffic of the underlying cellular system.

The basic components of CDDPD are the terminal system (ES) and the intermediate system (IS).

In Internet terminal technology, ES is equivalent to the host and IS is equivalent to the router. ES is the actual physical and logical end node for exchanging information, while IS is the basic structure for CDPD to store and transmit information.

There are two forms of ES: one is the mobile ES (M-ES), which is a device that the user accesses the CDPD network through a wireless interface, and the other is the fixed ES (FES), which is used by the general host, server or gateway to connect to the backbone of the CDPD and provide access for special applications and data.

A MES consists of a mobile terminal (PC or other standard device) and a CDPD wireless modem, which is connected to the mobile terminal and manages the wireless links and protocols. Typically, communication between wireless modems and mobile terminals is supported by standard serial protocols, such as Serial Line Internet Protocol (SLIP) or Point-to-Point Protocol (PPP).

There are also two forms of IS: one is general IS, which is a simple router (in most cases, an IP router) that does not contain CDPD and mobile components, and the other is mobile data IS (MD IS), which is a dedicated IS that can deliver messages according to the status of M ES at the current location.

MD IS consists of a set of hardware that provides functions such as exchange, accounting, registration, authentication, encryption, and mobility management. Mobility management software allows switching systems to track MES and allows M-ES to use unique network addresses.

1. Enter the setting function; 2. Select General; 3. Select the network; 4. Please turn on the cellular data switch; 5. Then select the cellular data network; 6. Please fill in the APN mobile in the cellular data, CMNET, Unicom, and UNINET. After setting it up, return to the home screen, and restart the main shutdown.

Hello landlord, it is recommended to try the network settings far away!

Failure to activate cellular PDP authentication fails, network recovery can be performed by restoring network settings.

1. First find "Settings" on the desktop of your phone and click to enter.

2. Then enter the settings page, find the "General" in it, and click to enter.

3. Then click to enter the general, find the "Restore" inside, and click to enter.

4, and then click to enter the restore page, find "Reset Network Settings" inside, and click on it.

5. After the restoration is completed, return to select the cellular network and restart the cellular data, which can solve the problem of failed to activate the PDP authentication of the cellular mobile data network.

How to set the Internet parameters of the Apple mobile phone:

Enter the mobile phone menu, select "Settings" - General "- Cellular Mobile Network" - Cellular Mobile Data Network", and enter "CMNET" at the APN of cellular data; Other fields do not need to be filled in or changed.

After the setting is successful, turn off the phone and restart it.

Hello, if you are using a mobile phone number, if you want to use your mobile phone to access the Internet normally, you can set the Internet parameters. The specific operation is as follows: you enter the mobile phone menu, select "Settings" - General "- Cellular Mobile Network" - Cellular Mobile Data Network", and enter "CMNET" at the APN of cellular data; Other fields do not need to be filled in or changed.

After the setting is successful, turn off the phone and restart it. Please refer to it.

Check if you are in arrears, and this is the case with mine. After getting it for most of the day, it's OK to recharge in the end.