Read Receipts on iPhone If you and your recipient both use the Apple iMessage service and activated read receipts, you'll see the word Read under your last message to the recipient, along with the time the message was read. If you don't want people to know that you read their messages, turn off read receipts.
On an iPhone
When you text someone with Read Receipts turned on, you'll notice the word “Read” beneath your message, and the time it was opened. To turn on your Read Receipts in the iMessage app, click Settings, scroll down, and tap Messages. Enable Send Read Receipts.
You must ask the recipient to enable the read receipts option in their Messages app. Only then can you see if the person has read your text.
If you backup or synchronize your phone to iCloud then anybody who has the details for that account, or even has their phone connected to the same account (a family member, for example), could potentially see your personal text messages.
Spyware can be used by anyone, not just hackers
One popular app, mSpy, boasts the ability to monitor text messages, calls and social media interactions. The app can be installed remotely on an iPhone if you have the proper iCloud credentials. For Android phones, someone will need to install it on the phone directly.
Unusually High Data Usage
An unusual surge in the amount of data your phone is consuming can sometimes be a sign spyware is running in the background. The spy app needs to use data to send information back to the perpetrator, so a spike in data usage may indicate foul play.
That's because the texts are being sent to an ID that is listed as an iMessage receive ID on both devices. See Settings > Messages > Send & Receive > You can be reached by iMessage at: Correct this so each device has a unique ID.
As an added precaution, you can input a code to verify whether your calls and texts are being forwarded. To do so, open the Phone app, access the Keypad, and dial *#21#. Finally, initiate the call by pressing the green button. *It may or may not work with every carrier.
Flexispy is one of the best spying apps to read someone's text message without access to the target phone for computers, mobile phones, and tablets. You can also uninstall or deactivate this app remotely. Flexispy lets you view all the sent and received messages with their contact and timestamp details.
A delivered text message status does not necessarily mean that the recipient reads the message. It simply means that the message was received by their device and is stored in their memory. The recipient may still choose not to read or open the message, even though it has been delivered successfully.
Alternatively, you can turn airplane mode on by using your finger to swipe down from the top of the screen to open the quick settings menu, and you can find many options there, including the Airplane Mode. Both Android and iOS can use this method. The Layout depends on which version of the device you are using.
If the bubble is green, it means the recipient isn't using an iPhone, which means the read receipts will not work. Android and iOS do not share read receipts by default, so you won't receive any feedback when texting your AndroidOS friends.
If you haven't been blocked, the status will read "Delivered." And if the person has enabled read receipts, it will later turn to "Read" once they open the message. A red flag that you've been blocked is when you don't see the delivery status or the read receipt at all.
If an Android user has blocked you, Lavelle says, “your text messages will go through as usual; they just won't be delivered to the Android user.” It's the same as an iPhone, but without the “delivered” notification (or lack thereof) to clue you in.
You can tell if your message has been sent via iMessage in Apple's messaging app because it'll be blue. If it's green, it's an ordinary text message and doesn't offer the read/delivered receipts. iMessage only works when you're sending messages to other iPhone users using the Messages app.
The best way to do this is to install an intruder detection app that takes a certain action when someone tries to spy on or tamper with your cell phone. The Certo Mobile Security app for Android devices is the best way to catch someone in the act.
Your Cellular Carrier Can See Your SMS Messages
With SMS, messages you send are not end-to-end encrypted. Your cellular provider can see the contents of messages you send and receive.
When you dial *#21#, you are, in fact, activating a feature access code that quickly tells you the status of call forwarding for your phone. It's a quick way of seeing what, in the case of this particular 'setting interrogation code,' your call forwarding settings. That's it, nothing more or less.
Code to check if phone is tapped: *#21# Code to show unknown connections and tracking (for Android): *#*#4636#*#* or *#*#197328640#*#* Code to show unknown connections and if someone is tracing you (for iPhone): *3001#12345#*
*31# (Disable Caller ID)
If you want to keep your privacy and prevent others from knowing when you call them, you can disable caller ID by using this code.
The Electronic Communications Privacy Act (ECPA) is a federal law that makes it a crime to access someone else's private communications without permission.
Assuming you're referring to iMessages, SMS, or MMS messages, the ONLY possible way for that to happen is to be using the same iCloud account for messages on both devices.