Could someone please recommend a text messaging app for Android that is reasonably secure?

Verizon is discontinuing their native texting (SMS) app. They recommend switching to Google Messages, but I would not like Google to have access to my entire text messaging history. I tried Signal, but my old messages don't transfer over (minor problem), and almost none of my family are willing to switch to Signal (big problem). When I search for advice, I get a bunch of AI slop articles and advertisements. So I figured I might have better luck asking here: Is there any text messaging app for Android that works well and isn't going to hoover up all my data?

I've been a long time Fi user on the Pixel line of phones, so I've always gotten the gold standard of service from Fi. My wife is an adamant iPhone user. We want to port her over to my plan, but I was hoping to get some recent feedback from anyone using a modern iPhone (just bought her a 16) -- All the things I find on Google are months to years old. If this is you, how well do the iPhone features (Visual voicemail, iMessage, RCS, FaceTime, 5G, etc) work for you on Fi?

I am going to be living in France for the next year. I want to keep my US mobile phone number, and I would like it to be somewhat usable while I am out of the country, but I can't find an affordable way do set this up. I am hoping someone here has some more insight for me.

I am going to be buying a French mobile phone plan (most likely through Orange) that will cover my data usage, along with a local number for calls and texts. I already have either whatsapp or imessage set up for calls and texts to/from my family in the US. Ideally, I would like to have my US number on a second sim on my phone. I wouldn't need any roaming data for that sim, just calls and texts, and my actual usage will be very small.

Here are the solutions I have explored:

1. Porting my number to Google Voice. This is probably the best solution, but I would like to avoid google if at all possible. This costs only $20 with no monthly fees. This would require me to use a separate app for this number. If possible, I would like to be able to use the iPhone system apps for calls and texts.

2. Some MVNO with international roaming. So far the best I have seen is Ting mobile. It costs $0.30 per minute calls and $0.12 per outgoing text. This pricing would be perfect for my extremely low usage. However it requires a $10/month pay as you go plan which is more than I want to pay.

3. IoT sims (although I am almost positive this won't work). These appear to be sms and data only, so for my usage they would be sms only. Telnyx is the service I found that actually supports esim (my phone has only esim). I am having trouble with the console, but I am trying to get an esim on my iphone. If this can work, it would be only $2/month plus usage, which would be perfect.

Are there any other possible solutions that I should look into?

Hey all,
Over here in Australia (imagine in USA and a few other countries), the 3G/2G mobile networks are being shutdown. My carrier Vodafone is gradually shutting its down with Dec 15th 2023 being the final closure date. The 4G network will have VolTE but my device (LG V20) does not appear to support VolTE nor does it look like i can update the firmware easily (if at all) to do so.
Anyone else have this issue with their phone? (i realise it will be older ones)
Question about VolTE though - will sms and standard voice calling still work on 4G on my device or similar devices without VolTE ?.
thanks
Nig

I have someone visiting the US from out of the country. They have a Google Pixel 6a, just need a temporary plan for a month or two. Mostly they're going to be home within wireless range, we're just looking for a little bit of data while going out. I imagine a few tens of MB/mo will suffice. Has anybody tried to do this recently? What should I expect to pay? I'm looking on Amazon, and the reviews seem filled with stories of being sold pre-expired SIMs.