2026-02-27
Caller ID spoofing apps fall into two categories: relay-based apps and SIP-based services. Understanding the difference is crucial to choosing the right tool.
Apps like SpoofCard and SpoofTel work by calling you first, then connecting your call to the recipient through their servers. Your real number calls their access number, and they place a second call to the recipient with your chosen caller ID.
Services like SpoofGlobal provide SIP credentials that you use with any softphone (Zoiper, Linphone, etc.). Your device connects directly to the SIP server, which routes calls with your chosen caller ID.
| FEATURE | RELAY APPS | SPOOFGLOBAL (SIP) |
|---|---|---|
| Cost per minute | $0.50-1.00+ | $0.05-0.30 |
| Billing | Per-minute credits | Per-second (6s blocks) |
| Call quality | Medium (relay) | High (direct SIP) |
| PBX integration | No | Yes (SIP/IP2IP) |
| Payment | Credit card | Cryptocurrency |
| KYC required | Often yes | No |
Relay-based apps are simpler (just dial a number) but expensive and limited. SIP-based services like SpoofGlobal require installing a softphone but are dramatically cheaper, higher quality, and more flexible. For anyone making more than a few calls, SIP is the clear winner.
SIP-based services like SpoofGlobal are the cheapest, starting at $0.05/min. Relay-based apps like SpoofCard typically cost $0.50-1.00+ per minute.
For SIP-based spoofing, you install a free SIP client like Zoiper. For relay-based apps, you install their specific app. Either way, a download is required.
SIP-based services provide better call quality because your device connects directly to the server. Relay apps add an extra hop that can degrade audio quality.