Is there a native solution on the C7 to send a text or sms message when specific user codes are used for door locks or low battery conditions and send them to selected cell numbers.
There are really two issues here: the text or notification itself, and how to make Hubitat send them. I'll start with the first thing.
If you want to be a literal SMS ("text") notification, then the only built-in option is Twilio. By "built-in," I mean that there is a driver built-in (so you don't need to install anything else on the hub) The service itself is a third-party service and requires a plan. See here for more on that: Twilio - Hubitat Documentation. However, lots of people--at least if they have a smart phone, as you likely do if you're using Hubitat--just want push notifications. You do not need anything special for that: the Hubitat mobile app can receive them. If you haven't installed the Hubitat mobile app already, it will create a device for your phone (or tablet) on your hub, and you can select that device when you're asked where to send the notifications--same as you would for Twilio or any other notification service (Pushover is a popular option but again not necessary).
As for how to get the notifications, that's the "when you're asked where to send the notifications" thing I mentioned above. 
Any app that offers you the ability to send notifications on Hubitat will ask where, so just choose the right device. Apps that can send notifications on Hubitat include the Notifications app, Basic Rules, Rule Machine, and a variety of community apps. For your lock-code use case, I believe the built-in Notifications app will suffice--just follow the prompts to set it up.
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Personally I prefer things to be simple. I've been using Twilio for quite a while with no issues. I don't use the Hubitat app so I can't compare the two methods.
Twilio is pretty cheap, some number of pennys per SMS. After signing up I give them $10 or $20 dollars. That lasts me a long time.
A thing I like about Twilio is I can send messages to multiple phones and those phones don't need any special app installed. So for me simple is best.
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