Sure no problem, take your time 
Its activate a specific SIM when a request comes in to PV.
Btw, just throwing it out there, in case someone is also a programmer. What i had in mind, is no doubt the DIY version of the very traditional GSM sms machine used by telemarketer.
After some thoughts, realistically, as pointed out by @BrandonBerner is 1 sim card needs to be active at a single point in anytime. This will save the cost of having to purchase the GSM module for every single sim, and expand it using the sim card tray only.
Iāve had a long research, and if weāre gonna get the actual machine, you would just need 1 channel GSM GOIP hooked up to a SIM BANK. The expensive part was the GSM unit, the cheaper one is the SIM BANK.
The goal in mind, is to replicate the above cheaply. But that wasnāt the ultimate goal of it.
This is :
It is to hook it up via API like those big boys at smspva.
Hello bro!! , can you tell me that iphone models dont need to remove the battery? . Thanks!!
Hmmā¦ all modern phones these days donāt need to remove batteries.
Had an extra 5 minutes so did a little research.
The sim cards are 6 electrical contacts (sometimes 8). On the 6 contact ones (I think these are the most commonly used), one pin is an NC (no connect) and two are power (which can probably be hard wired. That leaves 3 to be routed through a switch or multiplexer (so your concept of a 3 pole switch should be ok (3PST, no need for dual throw). I found somewhere that the cards can clock at 5MHz so long wire runs is not a good idea. Also, 100 wires into one solder point on the M590 module will not do well for the M590 driving impedances. I would suggest some sort of MUX chips to do the switching (so the chip is close to the driver(i.e. chip on the M590 module) and can provide good terminations to the driver. Of course, designing in the MUX means circuit board design, part selection, etc. You can try the switch concept but you may not be able to get very far before the driver chip canāt handle it. Just my 2 cents. Here are several links that may help:
sim info : https://www.engineersgarage.com/contribution/expert/sim-card-reader-for-6-pin-gsm
sim sockets for sale (~$0.2 per when 100 qty purchased): https://www.aliexpress.com/w/wholesale-sim-card-tray.html?spm=2114.01010208.0.0.fgEJnZ&initiative_id=SB_20170323194224&site=glo&groupsort=1&SortType=price_asc&g=y&SearchText=sim+card+tray
M590 kit (will allow stripping off of on board sim socket unless you want to desolder the one on a pre-made board): https://www.aliexpress.com/wholesale?minPrice=&maxPrice=&isBigSale=n&isShoppingCard=n&isFreeShip=y&isFavorite=n&isMobileExclusive=n&isLocalReturn=n&shipFromCountry=&shipCompanies=&SearchText=m590&CatId=0&g=y&SortType=price_asc&initiative_id=SB_20170323193916&needQuery=n&groupsort=1
3P11T switch (will get you 11 sims w/ relatively short lead to M590 although this is for line mains so may still have driver impedance issues): https://www.aliexpress.com/item/UXCELL-Rotary-Selector-Switch-3-Pole-11-Positions-3-Deck-220V/32799221867.html?spm=2114.01010208.3.105.prcA7N&ws_ab_test=searchweb0_0,searchweb201602_1_10065_10068_433_434_10136_10137_10138_10060_10062_10141_10056_126_10055_10054_301_10059_10531_10099_10530_10103_10102_10096_10052_10144_10053_10050_10107_10142_10051_10106_10143_10526_10529_10084_10083_10080_10082_10081_10110_10111_10112_10113_10114_10037_10078_10079_10077_10073_10070_10122_10123_10124,searchweb201603_3,afswitch_1,ppcSwitch_5,single_sort_0_price_asc&btsid=2077ce43-49dc-440b-9adb-1baa39e13e3c&algo_expid=30ac6536-b6c4-4dfb-992b-f278390ccb24-13&algo_pvid=30ac6536-b6c4-4dfb-992b-f278390ccb24
All the store links are to Aliexpress, my goto shop for all electronics parts. Many of the sellers on Aliexpress run the same products on eBay.
Not sure if this is helpful or just confusing Your mileage may vary.
Thanks @jeffajeffa for taking the time to do some research. I did not think about the 5MHz or lead problems. This just saved my ass.
After reading your entire reply, It looks like it is not possible for my original idea (Brandonās SIM Bay).
I have a new idea, which is based on the functionality of the old Slide by Slide Projector. Basically the projector would be the M590 enclosed in a small box, and the slide reel which holds the slides (pictures) would house multiple SIM Cards instead. All I would then need to do is replace the on board SIM tray which is horizontal, with a new vertical SIM tray. This would allow the sims which are on the reel to slide in and out.
The objective of this idea would be to organize a large amount of sims, and to increase productivity of fidgeting with sims and manually placing them in the on board horizontal tray. I may even be able to automate the reel to automatically insert a specific sim of my choosing to maximize efficiency. Lastly this would solve the 5MHz and lead problems.
In case it was not clear, I am not planning on using an actual slide projector. I would be creating using its slide design and create a much smaller enclosure to house the M590 chip, and an extended slide to house hundreds of sims (possible using a circle slide system instead of a straight slide so it can house more and conserve space).
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I think of a flow in the system that you thinked ? Also the time to turn on/off with buttonsā¦if you have 300 accounts under verification.
Did you considered the power consumption of all ?
Also i think connection an Raspberry Pi will remove the I/O buttons as you will have the control from the Pi ( no more additional soldering )
Bonus : you can make an web server and have to chose if you become a SMS PV Provider or use it for own porpose
check SMS Server Tools.
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Power consumption per sim card should be low as they are intended for mobile application (save the battery and the heat production). The mechanical swap concept is more tangible but less elegant and more subject to failure (alignment issues, munged sim cards or munged sim socket). A consideration is board layout from the sim sockets to the controller. If you want to check out the electrical MUX route, lookup the datasheet for 74151. Itās an 8:1 MUX and you may need up to 3 MUX per 11 sims (might be possible to gang connect control lines and just connect the data line for I/O.
Wow all of you doing all that just for PV 
I found a russian website that does sms that seems very unsaturated and itās working for me. PM me if you want it so it stays unsaturated
Awe, donāt ruin our fun :). Looking at the sim spec again. Probably can gang together the simsā V+, Gnd, Rst, and Clk (buffering on clock and reset, decoupling on power). Then, you only need to MUX the data pin (probably needs buffering). I donāt see an issue with leaving the sims in idle mode and only pushing/pulling data from one.
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Haha, now I feel like @dddd im lost now.
So your saying I could eliminate the on/off buttons and use a Raspberry PI wile maintaining 5GHz and short leads? I have always been interested to play around with the Raspberry Pie, however I have never gotten around to it. It truly is amazing since its so universal, and is only limited to your own imagination.
Oh thats great to know also! Thanks so much for the share! 
I totally agree with your point regarding the alignment issues, and munged sim and sockets.
Alright, you have proven yourself to be extremely knowledgeable in this area since every 6 word you write, I dont even understand haha. I am so lost now. I appreciate all the help and research you have done, but this is getting way to advanced for my current knowledge.
Looks like I will just be manually placing the sims into the M590 for each verification, until I have enough time to learn a more about electronics, raspberry IP, and others.
Thanks again!
Yep, things get complicated very quickly. Just FYI, itās 5Mhz (5GHz - no way a ucontroller can handle that). That said, 5MHz may be too much. And, there are a whole lot of ālittleā parts on those boards (like the m590) that help keep the signals sweet and not interfering. Take those out and all hell can break loose . Iāve been burned enough times to know that this little project needs a lot more work. How often do you have to PV a specific account anyway?
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I appreciate your expertise. Its saved me so much time in trial and error. I was in over my head with this idea, however I will still try and think of a more simple method to acheive this somehow. Back to the drawing board
I have to PV around 30-60 accounts a day. and I am slowing my expansion currently since its already consuming so much time. I have a few really good ideas in regards to having a huge amount of accounts, however I cant see it becoming a possibility until I can lower manual labor of phone verificationās.
First item arrived ! Its fast, with normal shipping method. 9 days, a record breaking for me for china stuff. But itās just this. 
Apr 03 - second batch of items arrived.
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So yesterday, i finally i got this, but had no idea how to i get it to work.
I connected it correctly to 3v tx rx ground. But it does not boot up.
USB to TTL with correct pins.
At the back is a mini usb. Connected to it, and also doesnāt have any response.
The schematics someone uploaded. Did it according to this guide.
According to various videos and guides, it seems i need to āshortā ground to ground or something. On other non assembled models, there is indication of BOOT, but this assembled one doesnāt show.
Great. Just found out using translate. So that means i need to find a way to connect it to boot, but i donāt have enough f to f jumper wires !
Edit 1:
I have properly shorted the ground to boot, but no response. Iām starting to think this is faulty.
Explanation why this proj can be a total failure. Firstly, i opted for the pre-assmbled model. But this model doesnāt have anyone on the interweb with guides. Secondly, iāve never done soldering and probably never will. It will take up 90% of my time as iām not a pro in this field.
So thatās the end of it. On hold till i have lots of spare time.
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Hello,
@dddd
I did not understand how can i see sms on pc?
please give detailed information about this.
Thanks.
One of the many videos in youtube showing how it works.
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