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More project information (code, schematic, pictures,....) on Instructables & EasyEDA: https://www.instructables.com/A-Box-T...
https://oshwlab.com/GreatScott/smscal...

Parts list (affiliate links):
Aliexpress:
1x Arduino Pro Mini: https://s.click.aliexpress.com/e/_APsmG8
1x A6 GSM Module: https://s.click.aliexpress.com/e/_98ih6y
1x NEO-6M GPS Module: https://s.click.aliexpress.com/e/_A5Pys4
2x Slide Switch: https://s.click.aliexpress.com/e/_99gyF2
1x Tactile Push Button: https://s.click.aliexpress.com/e/_A3GIVQ
1x TP4056: https://s.click.aliexpress.com/e/_dX8...
1x LiPo Battery: https://s.click.aliexpress.com/e/_996Mx2
Amazon.com:
1x Arduino Pro Mini: https://amzn.to/3D0YFiM
1x A6 GSM Module: https://amzn.to/3D1bdXN
1x NEO-6M GPS Module: https://amzn.to/3D2hpyB
2x Slide Switch: https://amzn.to/3DZRpVO
1x Tactile Push Button: https://amzn.to/3FThzdn
1x TP4056: https://amzn.to/32FcNC6
1x LiPo Battery: https://amzn.to/3refAfN

In this video I will show you how I turned a big and clunky electronics project into a rather small form factor that can easily be carried around. The project itself can call your phone and send an SMS with GPS information. The new credit card sized PCB version can do all of that while being way smaller. The reason is a 4 Layer PCB design which I will tell you all about during the video and how you can make your own. Let's get started!

Useful websites which were shown/mentioned in the video:
https://www.electrodragon.com/w/GSM_G...
https://www.smart-prototyping.com/ima...
https://www.makerfabs.com/wiki/images...
https://www.electroschematics.com/neo...
http://wiki.sunfounder.cc/index.php?t...

Thanks to JLCPCB for sponsoring this video.
Visit https://jlcpcb.com to get professional PCBs for low prices.

0:00 My old project is TOO BIG!
1:26 Intro
2:08 Component sourcing
3:16 Creating the schematic
4:25 4 Layer PCB design
6:48 Soldering the PCBs
7:55 First test & troubleshooting
9:08 Final Test & verdict