Pros
- Number management is super easy
- Cost effective enough to fly
- The interface is extremely friendly
- Call quality is excellent
- Personalization options are so dazzling
3.8 Communication 13.19 5.00M








Have you ever had that kind of crazy experience? Work and personal calls are mixed, but you don't want to bring two mobile phones? Don't worry, Sideline may be the savior you've been looking for! This app is tailor-made for those who need extra numbers, and it's very easy to use. The development team is focused on simplicity and reliability, so it has quite complete functions. It is especially suitable for those professionals, entrepreneurs who are too busy to touch the ground and value privacy and efficiency, or those who simply want to live a refreshing life. friends.
The most popular thing about Sideline is that it can play the "second phone line" like it is real, but it is much more flexible than a physical card. Look at its stable call management, it can share pictures, documents, etc. quickly, and messages are sent out quickly. It is simply a good partner for you in both work and life. Come on, let's talk about it carefully. Where is it in those various communication apps?
Seriously, opening Sideline for the first time feels like walking into your ideal office-clean, clean, and everything is just placed. The interface is not messy at all. Every button is in the right position. You can flip through call records, flip through contacts, and adjust settings. It's super easy and basically doesn't need to use your brain. And it responds very quickly. When I try it, I don't get stuck at all, and the page switching is as smooth as skating. There is no pressure at all for novices on the road, the label is clear, the process is simple, and you can have fun in a few minutes.
After all, the core of Sideline is to give you a real second mobile phone number, which is extremely simple to set up. Whether you want to create a dedicated sideline account or simply want to separate personal contacts, the app's call transfer is as reliable as a landline phone. The sound quality is very clear, and there are also functions such as custom voicemail, caller ID, and call forwarding, which instantly makes you look very professional. I have tried it myself, and no matter how busy I am, the call is clear and there is no delay or disconnection at all. For business people, this stability is really critical.
Sideline can't make phone calls, and it has a good ability to share things. Sending photos, videos, and voice messages is very quick, and the upload speed is as fast as the blink of an eye. Think about it, taking a product photo in a hurry or sending a voice message is as easy as passing a postcard on the table. Its real-time message speed is really fast, and there is a delivery receipt, which makes you feel at ease. Unlike those apps that get stuck all the time, Sideline never goes around when processing media files. This is so considerate for people who need to communicate quickly every day.
What really convinced me about Sideline is that it is stable and versatile. Even if the signal is not very good, thanks to its optimized underlying technology, real-time messages and calls will still benefit smoothly. You don't wait for news to arrive like you do with some apps, or the phone can't be connected for a long time. And it can not only send pictures, but also easily transfer video clips, voice memos, and even PDF documents. This versatility makes Sideline a truly all-round communication tool that can handle it easily whether you're making a hasty phone call or sharing a pile of documents with a colleague.
Anyway, I have experienced it in depth and think Sideline is definitely a reliable and practical second-line App. Its specialties-especially the stability of real-time messages and the smoothness of sharing media-are simply for people like us who can't live without mobile phones every day. The interface design is clean and intuitive, and even novices can understand it in seconds. The technology behind it is solid, and it can be stabilized under various circumstances.
If you need a dedicated work number, or want to completely separate work and life, Sideline is worth a closer look. It is stable and easy to use, and it is very easy to use and has high call quality. To be honest, if you are dizzy by multiple numbers, or you just want a reliable app that can handle both phone calls and messaging, try it. All in all, Sideline is not just a second number, it is more like that trustworthy voice partner who is always online in your pocket. When you need it, it is definitely there.
Download the APP, open it, choose your favorite area code or beautiful number, and then follow the Settings Wizard-just get it done step by step in "Settings">"Account">"Number".
Of course you can! When setting up, you can choose one of the available local numbers, or if you want a beautiful number, just go to "Settings">"Numbers">"Select Numbers" and apply for it.
It has a free basic version, but advanced features have to be paid for and can be managed in "Settings">"Subscriptions".
There are many functions! Including calls, text messages, voicemail, custom greetings, contact sorting, automatic replies, call tags, etc., you can find them on the main interface.
Open Sideline, select the second number, and then dial or send a message just like using the main number, just operate on the chat and call interface of the app.
Sure! It supports multiple device use. Log in to your account for each device and you will be able to access the second number in Settings> Devices.
Sideline offers a convenient second phone number and is praised by some for its ease of use, quick contact retrieval, and reliable basic calling. However, major issues dominate user feedback. Account problems are severe: many users report being locked out, facing suspicious activity flags during sign-up, or losing access entirely, with no phone support and slow email responses. Functionality is inconsistent—while texting works well for some, others experience failed image sending, missed calls without ringing, and no text search feature. Privacy concerns are raised by a user detecting 253 tracking attempts in five minutes. Billing complaints are common: some were charged despite unsupported area codes, and the app shifted from free to paid without notice. Overall, while a few find it the best second-line option, most users describe it as unreliable, frustrating, and recommend alternatives like Google Voice or Text Free.
Please cancel my subscription. I cannot do it myself and I don't know why.
Really nice and enjoyable experience.
This is the finest second line available.
Previously, calls in this app were free, but now they charge.
I enjoy using the app and it meets my needs. However, I would appreciate the ability to archive messages instead of deleting them, so I can revisit them later.
Communication 4.2 Get
Communication 4.3 Get
Communication 4.7 Get
Communication 4.8 Get
Communication 4.6 Get
Communication 4.3 Get
Communication 4.2 Get
Communication 4.5 Get
Communication 4.5 Get
Communication 4.5 Get
Communication 4.6 Get
Communication 3.8 Get