Android Sms Gateway Server Multi Device: In-Depth Guide

Android SMS gateway server multi-device is Hub F capacity: you already have a reachable control plane, and now you are adding named phones so OTP, receipts, and campaigns do not share one radio. It is not a rewrite of dual-SIM hardware, and it is not the failover fire-drill page.

Service pricing is based on device count and total SMS sent through the gateway. Architecture: server guide. Feature: multi-device / dual-SIM. Failover spoke: failover setup.

Five phones on one USB charger and one unpaid prepaid is not a fleet. It is a single point of hunger.

Many phones, not one dual-SIM

Dual-SIM can pick a slot on one chassis. Multi-device survives a smashed screen because another deviceId still answers. Backup device.

Pool design

Plan device slots

Count every connected dock. Device-count planning. Pricing: Free/Developer 1 device; Starter 2; Professional 5; Business 15. Platform send volume on the last three is not a Developer-style SMS cap — carrier fair-use and device meters still apply. You need a working Android phone with a SIM and SMS credit from your mobile operator. Operator message costs are yours—we do not sell carrier SMS balance.

deviceIds on send

Documented split (docs win):

curl -X POST "https://app.sms-gateway.app/api/v1/messages" \
  -H "Authorization: Bearer $SMS_GATEWAY_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"to":["+14155552671"],"text":"Your login code is 481920. It expires in 5 minutes.","type":"sms","deviceIds":[3]}'

Name devices in the panel so on-call is not guessing serials. Confirm fields in OpenAPI.

OTP ring-fence

Pin login to OTP deviceIds. OTP. Pace promo on the others. Bulk.

Checklist

• Each dock named, charged, exempted, funded.
• Slot count includes spare.
• OTP deviceIds never on campaign workers.
• Last-seen alerts per device.
• No invented simSlot / failover flags.

Next steps

Pair the second phone before you need it. Kill the primary in staging. Prove OTP still leaves the cyan dock.