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Sorry for the perhaps unrelated question, but why do you want to verify phone numbers?
If it's for 2FA it's more secure to allow using TOTP apps.
Sure not worry.
A service where the user would receive email+ sms ( obviously not spam) about the service at certain moments not 2FA. People usually elderly are used to SMSes more than checking emails. Open to another options for sure. If they could work better
Browser push notifications come to mind: https://developer.chrome.com/blog/push-notifications-on-the-open-web
But probably not as reliable (if they get a new phone or reinstall the browser they might no longer receive notifications). So I agree that in your case SMS is probably a good option. Haven't had experience with it so can't recommend any specific services.
Another option would be a Telegram or WhatsApp bot if those kinds of Messagers are popular where you're at.
Thanks for the feedback! Yeah SMSes are used to be the golden standart i know there are limited and old fashioned but +60 years old population are used to them. If you speak about notifications telegram or whatsapp yes they could work nicely in more younger generations. It is an option for combination of them
Many thanks for your opinion/advice!
if your only intention is to verify user and not sending promotional or other sms use google firebase otp service.
google firebase is reliable and best for otp and you can use it for free (upto the limit, limit depends on several factors).
https://firebase.google.com/docs/auth/web/phone-auth
thanks let s check it out
I only know country specific solutions other than Twilio but I've been using Twilio as well for a long time (more than five years) and they're definitely prem. Amazing delivery rate (not in SMS Spam "folder"), good API and fast support. I was testing Plivo too, they were good but did not have as many delivery options as Twilio. If it's just for some notification SMS they should be equally suiteable.
Thanks for the feedback. It is really appreciated. I would check Plivo as well.
Amazon SNS
I am using Twilio for sending whatsapp to customers, although you have to use templates that they need to approve for any first message to a customer..
Try Sendbird. Our company eventually moves to a local vendor who is a WhatsApp partner to save more cost.