I have been on G7 for a few months now. The pharmacy shipped out these to me in like March or something (can’t remember). I’ve had an issue with sensor removal (that I shared in a previous post). The other issue I have from that first batch of G7s is that two of them didn’t work. You push the button and nothing happened. I have gotten a replacement from the company on one of them. Need to report sensor failure for the other one. It’s somewhat accurate though not always. When it says I’m low (at night, especially) I have to test to confirm if I’m not experiencing symptoms. Sometimes if you accidentally lay on the arm where your sensor is placed, it can give you a false low, but this was true with G6 too. I like the fact that it’s all in one.
My endo gave me a G7 “sample” and I tried it for 10 days. I’ve been on the G6 for 4 years and happy with it.
Pros
- Fast warmup time (30 minutes)
- Smaller size, I really did notice its lower profile got snagged less on cloths
- iOS App is better and has new features related to alerts and data
- Accuracy seemed similar to G6
Con
- Seems it can’t be far from my phone
- G6 is reliable at 30 feet G7 seems like less
- G7 lost contact with phone while in my front pocket while walking (did this everyday)
- I had to hold my phone in my hand for 5 minutes to get a reading while walking
When ever it’s time to switch from G6 to G7 I’ll do it. It’s overall a noticeable improvement.
Your pros and cons are very similar to what I’ve experienced. I’ve been using the G7 for the last month. With the cons, I too was surprised when I’d lose contact when my phone was in my pocket, and that didn’t happen with the G6.
I’ll add one additional con that may be a problem for some. Since the transmitter and sensor are in one unit now, I’m not sure how it can be restarted. Maybe someone will find a hack.
I’ll also add 3 additional pros I personally like. The first is the application of the sensor and transmitter is much easier than the G6. I often had bleeding with the G6 that I haven’t had yet with G7. My nephew and I used to laugh about the G6 application as we thought we were using one of those nail guns. The second pro is that the box is so much smaller so when traveling the G7 takes up less space in my knapsack than the G6. The third pro is the 12 hour grace period when the G7 times out.
All and all, I’m pleased with the G7.
Still looping with the G7. I serously thought aboug going back but didn’t catch the shipment of my next order in time, so I’ll continue to see how it goes. Of the 9 that I had in my first 90 day box I’d say I had to replace at least 4-5. I lost count. This is way too high. Some just gave funky numbers days early. Others plain stopped and said re replace. All around day 6-8. Not sure what’s going on.
Tried my arms but I’m just too sweaty/oily in my arm for it to stick, so usingmy stomach exclusively.
Love loop btw. If you haven’t tried it, read up and see if it is for you! I love using only the phone and dosing from my watch!
curious to know if you are looping with xdrip? or the dexcom app? im currently on my 3rd g7 and haven’t had problems yet, looping with aaps, but the g7 seems a lot quicker and more accurate, I’m under the impression xdrip helps with smoothing out the g7 numbers
With G4,G5 and early G6 transmitters, xDrip could be set to Native or xDrip (raw data mode) algorithm.
But then dexcom limited the G6 so only native worked.
Older 80xxxx/81xxxx G6 transmitters can work in raw mode with the possibility of processing all data using the xDrip algorithm and manual calibration. Sensor session limits do not apply in this mode. Newer G6 “Firefly” transmitters (>8Gxxxx) and ONE will only work in native mode using the algorithm inside the transmitter.
I would guess that dexcom G7 does the same.
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Hi again Marilyn - what do you mean by ‘pre-soak’? This sounds very interesting!
Pre-soak means you insert new sensor before the current one is done, but don’t put transmitter on or start sensor yet.
This allows the sensor wire more time to settle, and then often gives better, more stable/accurate readings sooner.
Thank you 
! My readings have been quite inaccurate with Dexcom G6 - I will try this for certain.
Some of us put on a new sensor 12 to 24 hrs before the previous sensor has finished. I have the most success when I have worn two sensors for at least 12 hrs, and started the new sensor a couple of hours before the old sensor has finished working. I stop the old sensor and then start the new sensor. The one I am using now is quite accurate.
I’m going to try that next time I switch my sensor for sure. Thank you so much Marilyn 
I don’t like the reports of the lost signal and waiting to get a reading. I leave my phone on a table and wander around the house and most of the time my phone still reads my numbers. If I go to the other end of the house, if it loses it’s signal, it picks it back up pretty quickly. If people notice an improvement in the signal loss let me know! I suppose I could carry a reader around all the time, it’s smaller and lighter, but I prefer using my phone and it won’t fit in my pockets easy.
I expect anyways I will hold out switching until I have too. I like restarted sensors better and not having to deal with a new sensor every 10 days. The one I am wearing is on day 22 and going strong. 2 calibrations and it is only 12 points higher. One more calibration should get it within my 5 points of preference.
@Marie20, I notice the same kind of dropouts with the G6 when I am outside. To get consistent readings outside, my iPhone has to be in my pocket on the same side as the G6. Inside the house it does not matter. My guess is that the Bluetooth signal reflects on the walls and therefore it works. When I am outside walking, the Bluetooth signal has nothing to reflect on and having my body between the iPhone and the G6 is too much of an obstacle. I haven’t tried the G7 yet.
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@Helmut This started me thinking. Interesting, because my phone is in my purse when I am out and about running errands and I have never noticed it losing it’s signal. Siri won’t always talk to me, but the Dexcom has always kept a reading going. My phone is in a smaller clear vinyl purse inside a larger purse as I don’t always take my larger purse into stores with me.
Of course I had to experiment some! I put my phone into a right back pocket and the sensor is on the front of my left arm, I went outside for about 20 minutes. It even beeped at me in my pocket to let me know I was going high and when I pulled it out right before I went in, it still read my numbers. Then I left it on a table about 10 feet inside and went outside for about 10 minutes, french doors, a lanai and sliding door separated us and about 10 feet of lawn. I left it on inside and it was still reading my BG level when I came in. It could have quickly communicated as I approached though. My brief one time experiment, maybe it decided to work and wouldn’t on a different day. But I do know my purse doesn’t stop it and in my purse in the back seat doesn’t stop it either. I have an iphone 13 pro max. My dog loved the experiment, lots of ball throwing for her!
However underwater in a vinyl case it won’t! And it takes at least 10 minutes to communicate when I get out of the water to give me a reading.
@Marie20, I have an iPhone Xs. Don’t know whether this makes a difference. I will buy an iPhone 15. Will be interesting to see whether that will be better.
That’s a fact of life- radio frequencies are quickly attenuated by water. Bluetooth, WI-FI are RF. I don’t think there well ever be a way around this fact.
I asked ChatGPT “how do submarines communicate under water?”
Submarines use various methods to communicate underwater. Due to the limitations of transmitting signals through water, submarines employ specialized techniques and equipment for effective communication. Here are some common methods used by submarines:
- Sonar: Sonar (Sound Navigation and Ranging) is a primary method of underwater communication. It involves the use of sound waves to transmit and receive signals. Submarines emit sound pulses, which can travel long distances underwater. These sound waves bounce off objects and return to the submarine as echoes. By analyzing the echoes, submarines can detect other vessels, communicate with other submarines, or gather information about the surrounding environment.
- Underwater Telephone: Submarines often utilize underwater telephones or communication systems, also known as underwater acoustic communication systems. These systems use low-frequency sound waves to transmit voice messages or coded signals between submarines, or between submarines and surface ships or aircraft. The acoustic signals are generated by hydrophones (underwater microphones) and received by similar devices on the receiving end.
- ELF (Extremely Low Frequency) Radio: Extremely Low Frequency radio waves can penetrate seawater to a certain depth, allowing for long-range submarine communication. ELF systems are used for strategic military communications, such as transmitting orders and important messages to submarines on patrol. However, ELF communication is very slow, with data rates measured in characters per minute.
- VLF (Very Low Frequency) Radio: Very Low Frequency radio waves can also penetrate seawater to a limited extent. Submarines equipped with VLF communication systems can receive signals from shore-based stations or surface vessels that emit VLF signals. However, the range and data transmission rate of VLF communication are relatively limited.
It’s important to note that underwater communication is slower and more challenging than communication through air. The speed of sound in water is much higher than in air, and the range and quality of communication can be affected by various factors such as water temperature, salinity, and underwater terrain. Submarines must employ sophisticated equipment and techniques to overcome these challenges and ensure effective communication.
ELF wiki article