reddit · SaaS · 10-05 05:50 60 分 ← 返回列表

sending otps through an old android phone sim because sms providers here cost way too much

ok so this started because i got annoyed at how much international sms costs when your users are in egypt and the gulf every otp feels like paying a toll and half the small shops i know have a spare phone in a drawer with a cheap local sim bundle that barely gets used so i built a little android app that turns that phone into the sender the backend queues the message and the phone sends it through its own sim thought it would be a weekend hack and it turned into way more than that the sen

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痛点：埃及/海湾地区国际 OTP 短信成本过高，小商家虽有闲置安卓手机和廉价本地 SIM，但缺少可靠、低成本、防重复的本地短信发送方案。

目标用户：面向埃及/海湾用户发送 OTP 或通知的中小企业、独立开发者、跨境电商和本地小商户。

证据：international sms costs when your users are in egypt and the gulf every otp feels like paying a toll; half the small shops i know have a spare phone in a drawer with a cheap local sim bundle that barely gets used; the phone sends a message then loses wifi for a minute and never tells the backend so the backend retries and someone gets their otp twice

变现：按成功发送 OTP 条数收费，或提供月度套餐；可叠加托管后端、路由优化、去重/幂等保障和本地合规支持，按国家/运营商差异化定价。

MVP：2周内做 Android 发送端 + 云端消息队列 + 幂等去重 + 发送状态回调，支持单台手机单 SIM 和后台手动路由；先找1-2个埃及/海湾小商户做代发测试，验证到达率和重复 OTP 问题。

竞品：Twilio、Vonage、Infobip、Android SMS Gateway 类开源/商业应用（如 SMS Gateway API、Textbelt）、本地短信代理商/短信路由商

摘要：发帖人因埃及和海湾地区国际 OTP 短信太贵，用闲置安卓手机+本地 SIM 做了短信发送端，后端排队、手机通过自身 SIM 发送。开发中遇到并发抢手机和手机断网导致 OTP 重复发送的问题，他加了 unknown 状态但仍不确定是否可靠。项目尚早且粗糙，正在询问是否有人尝试过或是否只敢用于通知而非 OTP。