Invented by DATLA; Jagannadha Anudeep Varma, BALAN; Harikishore Allu, DESHPANDE; Mallika Sudip

In today’s world, we rely on our phones and tablets to stay connected all the time. But what happens when your data connection suddenly drops? This new patent application brings a smart way for devices with more than one SIM card to keep you connected, even if one network fails. Let’s break down what this invention is all about and why it matters.

Background and Market Context

Mobile devices have become the backbone of our daily lives. We use them to send messages, make calls, work, and play. For businesses and emergency responders, these devices are even more critical. Staying connected can sometimes be a matter of safety or getting work done efficiently. One special feature that many people rely on is called push-to-talk (PTT). This lets people talk to each other instantly, almost like using a walkie-talkie, but through their phones.

The world has moved quickly from old 2G networks to new 5G networks. Along with this change, phones have become smarter. Many phones now let you have two SIM cards, or profiles, in one device. This means you can be connected to two different phone companies at the same time. People often use this to separate work and personal calls, or to get better coverage by using two networks.

But even with two SIM cards, there is a problem. If your phone is using one network for data and that network fails, you usually lose important services like push-to-talk. This is a big issue for people who must have a steady connection, like police, firefighters, or delivery drivers. If the phone tries to switch to a second SIM card, it often loses PTT because the system thinks the user is trying to trick it or change their identity.

The market for solving this problem is huge. Emergency services, companies with field workers, and even regular people who travel between areas with weak signals all need reliable connections. Being able to switch between networks smoothly, without losing features like PTT, would make devices much more valuable. It would also help phone companies offer better services for demanding users.

This invention steps in to fill that gap. It brings a way for your phone to keep PTT working, even if your main network fails. It automatically switches data to another SIM card, but keeps your PTT service running on your main profile. This is important for business, public safety, and anyone who cannot afford to lose their connection.

Scientific Rationale and Prior Art

To understand why this invention is special, it helps to see how things work in today’s devices and what has been done before. Most modern phones use SIM cards to connect to phone networks. Some phones use real, physical SIM cards. Others use something called eSIM, which is just a digital version stored on your device. Dual-SIM phones can use two of these profiles. But usually, only one profile is active for data at a time.

PTT services work by letting phones send short voice messages over data connections. These services must know exactly who is using them, and they often tie your PTT ability to a certain SIM card and network. If your phone loses that network, the PTT service usually stops. If you switch to another SIM profile to get data back, the PTT provider may think you are a new user and kick you out. This is because the service checks that your SIM profile matches the one you signed up with.

Some devices let you change your data SIM profile, but switching is not smooth. You may have to restart your phone, log in again, or even lose your place in a group talk. There are also security reasons why services want to tie PTT to a single SIM card. They want to make sure that the right person is talking and that the service is not being abused.

In the past, there have been some ways to switch between SIMs for calls or data. But no one has made a way for a device to keep using PTT from one SIM profile, while getting its data from another profile, all without logging out or losing service. Prior systems could switch data channels, but they could not keep advanced services like PTT running on the original SIM. If you lost your network, you lost your PTT.

The need for better fault tolerance has grown with the move to cloud-based services and instant communication. Some solutions have tried to use Wi-Fi or other backup connections, but these are not always available, especially on the move. Others have tried to build in failover at the network level, but that often requires special equipment or contracts with phone companies.

This patent solves a hard technical problem: how can a device detect when its main data channel fails, switch to another network using a second SIM, and still keep using the special features and identity of the first SIM for services like PTT? No current solution does this in an automatic, seamless way. That’s the unique step that sets this invention apart.

Invention Description and Key Innovations

Now let’s look at what this invention actually does and how it works in simple terms.

This system is made for devices that have more than one SIM profile—either two physical SIM cards, two eSIMs, or a mix. The key is that each SIM profile can be linked to a different phone company, giving the device two ways to connect to the internet.

Here’s what happens with this new system:

First, your device connects to the internet using the first SIM profile. This is the profile that has PTT services set up. You are able to use PTT and everything else as normal.

If the device notices that the data channel (the way your phone connects to the internet) stops working, it quickly starts a process to fix the problem. It sends a request to log in to the network using the second SIM profile. Once this second profile is connected, the device uses it to get a new data channel—basically, a new way to get online.

Now, the magic happens. Even though the device is getting its data from the second SIM profile (and possibly a different phone company), it keeps using the first SIM profile for the PTT service. The PTT provider sees the same user and allows the service to keep running. The device does this by sending both SIM profiles’ information when it switches, so the service knows the user is the same person.

If the first data channel comes back, the system can switch back to it. The device checks regularly to see if the original connection is working again. If it is, it re-connects using the first SIM profile for both data and PTT, making everything seamless for the user.

This switching can happen automatically, so users do not have to do anything special. The device always tries to keep you online, using whatever connection is working, without losing important services like PTT. This is a huge step forward for reliability.

There are more smart details in the invention. For example, the system can do health checks to see if a network is up or down. It can handle both electronic and physical SIM profiles and can work with any kind of device—phones, tablets, or even special radios used by emergency workers. It also works with different network types, including 3G, 4G, or 5G.

What makes this invention special is its ability to split the service identity (like PTT) from the data connection. It makes sure that users do not get logged out or lose their place in a group talk, even if they move between different networks. It can even handle switching back and forth as needed, always trying to use the best connection.

The system is also designed to work with the way phone companies and PTT providers handle security and user identity. By sending both SIM profiles’ information during the switch, it keeps everything secure and makes sure only the right user gets access.

This invention is not just for emergencies. It is useful for anyone who needs a steady connection—delivery drivers, remote workers, travelers, or anyone in an area with spotty coverage. It could also help phone companies build better services for customers who want never to lose touch.

In summary, the key innovation here is automatic data channel switching on devices with more than one SIM, while keeping special services like PTT running smoothly and securely. The device can always use the best available connection, without losing features or making the user log back in.

Conclusion

Staying connected is more important than ever. This invention brings a new way for multi-SIM devices to keep working, even when one network fails. By letting devices use one SIM for data and another for special services like push-to-talk, it solves a problem that many users face every day. The system works in the background, keeping users connected, safe, and productive without any extra work on their part. This kind of smart, seamless switching is the future of mobile devices and will help shape how we stay in touch in the years to come.

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