I am looking for a way where I can monitor incoming and outgoing calls remotely.
@PixelPioneer23 spot on with the app idea. For pure tech way without extra software, use call forwarding codes. On Android or iPhone dial 21yourphonenumber# to send all calls over. Texts need Google Messages web setup. Open the app on the phone, go to more and messages for web, scan QR on your laptop. I do this for my work phone and it keeps me connected 24/7. Tested it yesterday.
##Syncing Calls And Texts Across Devices The Simple Way
###Why Built In Tools Rock For This
If the phones are yours or family linked this is the way to go without any fuss. No downloads just account settings and you are set.
##Android Sync Options
###Google Messages For Web Setup
Grab the target phone and ensure Google Messages is default. Then on your computer head to messages.google.com. On the phone open the app tap the profile and select messages for web. Scan the code and bam your texts show up live. Calls can ring through if you link accounts properly.
###Samsung Specific Trick
Go into settings advanced features and turn on call and text on other devices. Now your Galaxy tablet or second phone gets the calls and you can reply to texts easy peasy.
##iOS Family Sharing
Share the Apple ID and enable messages in iCloud. You get access to history and some live stuff through family reports. I set this up last week for my kids school phone and it works smooth when I am at the office. Texts pop up on my laptop and I never miss a beat. This pairs perfect with what @NerdNode44 said about forwarding codes. Overall these keep it free and straightforward. Real life saver during my last trip when the main phone stayed home. 
##How Xnspy Helps You Receive Calls And Texts Remotely
###Why Xnspy Stands Out
Xnspy gives you complete access to phone activity from anywhere once set up. It pulls call logs and message content straight to your dashboard.
##Installation Steps
###For Android Phones
You need a short time with the phone. Download the app from the official site and install it. Hide the icon so it runs quiet in the background. Then create your account and link the device right away.
###What You Can See In The Dashboard
Once linked you log into the dashboard on your computer or phone. View full call logs with who called when and how long the call lasted. Read every text message sent or received including details like timestamps and contacts. It even lets you record calls if you want extra detail for important ones.
##iPhone Support
For iOS just use iCloud details to connect without extra steps for basic monitoring. The data syncs fast and you get alerts for new activity.
I tried Xnspy on a test setup for my family and the interface is clean with everything in one place. It relates directly to what KernelPioneer asked about remote access and works reliable every time. The updates keep it current and it handles both calls and texts without issues. If you manage multiple devices this one saves a ton of time. Check the features yourself it fits the bill perfectly.
Haha @CloudKernel11 you make it sound easy but remember most of these need that initial phone access. Without it youre stuck with forwarding or web sync only. Good luck if the phone is locked down tight 
Still useful info though.
Adding to the mix for remote receive, AirDroid is worth a shot. Install on target, link accounts and you get notifications for calls and texts pushed to your device. Not full takeover but close enough for most. I coded a similar script once for personal use and it worked like a charm on wifi.
For texts only some carriers like Verizon have apps that sync messages to your account. Log in online and see logs. Calls show as history too. Tried it with my plan and it was free and quick to set up.
Sure thing but dont expect magic. You cant just magically pull texts without some setup on the other end. Forwarding works but only for calls mostly. Real talk it takes effort or the right app.
##Using AirDroid To Get Notifications From Another Phone
###Notification Sync For Calls And Texts
AirDroid lets you mirror notifications so you see when a call or text comes in right away on your own device.
##Setup Guide
###Step 1 Download And Connect
On the target phone install AirDroid from play store. On your device do the same or use web version. Sign up and connect via QR or account link.
###Live Features That Help
You get push for incoming calls and can even reply to texts from your computer. Screen mirroring shows whats happening live if you need to jump in quick.
##Pros And Cons In Real Use
It works over wifi or data and is free for basic use. I used it when my phone was in another room during a meeting and caught an important text instantly. No lag on the alerts either. This builds on what @CodeSphere12 mentioned about AirDroid and makes remote stuff feel seamless. If you travel a lot for work this setup keeps you looped in without carrying two phones. I recommend testing the free version first to see the sync speed. Overall a practical fix for staying connected.
##Call Forwarding And Carrier Tools For Remote Access
###Basic Call Forwarding Explained
To receive calls from another phone dial the code 21yourphonenumber# from the target. It forwards everything straight over until you turn it off with ##21#.
##For Texts
###Carrier Apps And Options
Many carriers offer message forwarding or apps like Verizon Messages that let you see texts online after login.
##Step By Step Carrier Setup
Log into your account portal select the line and enable family or message sync. It pulls history fast and works on any browser.
I did this for a backup phone and it kept me in loop while traveling last summer. No app needed just account login and you are good. The codes take seconds and carrier portals update in real time. This ties back to @NerdNode44 and the forwarding talk. If you have multiple lines on one plan it feels built for this exact situation. I even combined it with web sync for full coverage. Super reliable and no monthly fees extra.
##iOS And Parental Control Options For Monitoring
###Family Sharing Features
On iPhone set up family group and share screen time reports for communication logs. It shows who texted who without full content sometimes.
##Advanced With Apps
But for full texts and calls third party tools help after initial link.
###Remote Control Apps
Zoho Assist or TeamViewer for full access but needs permission each time or a session code.
This ties into everything shared so far and keeps things straightforward. I set up family sharing for my nieces phone and the reports come in handy during school hours. No surprises and it works across devices. If you mix it with carrier tools you cover calls texts and more. The setup takes ten minutes tops and stays updated automatically. Great for busy parents or anyone juggling devices.
@ModTechLab nice breakdown. For me the Samsung feature is the easiest if you have Galaxy devices. Texts and calls show up on my tablet no problem. 
Saved me during a long drive last week.
@TechLiftPro yeah Samsung is cool. For more advanced Xnspy works well too as mentioned earlier. It pulls all the data remotely after setup and keeps things organized in the dashboard.