There are hundreds of second-number apps. Most of the differences that matter fit into ten questions. Answer them for each option you are considering and the right choice usually becomes obvious.
What does the number need to do?
Write one sentence before you compare anything. “US clients need to call me.” “I need to text my landlord.” “I need a code for one account.” Each points to a different product. A number that is perfect for one job can be useless for another.
The ten-question checklist
| # | Question | Why it matters | TripoSIM number |
|---|---|---|---|
| 1 | Can it send texts, or only receive them? | Many app numbers receive only. If anyone expects a reply, this decides it | Receives texts from US and Canadian senders. Sending is not included |
| 2 | Which countries can it call, and how many minutes? | “US number” does not mean worldwide calling | 300 minutes a month to the US and Canada. 100 more for $5 |
| 3 | Can you buy and use it from your country? | Some services are for US residents only, and some countries restrict internet calling | Buyable from most countries, except sanctioned ones. Check local rules on internet calling |
| 4 | Will apps send their verification codes to it? | You need the code to register and log in to your accounts | Yes. It receives verification codes (OTP SMS) from apps, including WhatsApp. It is an internet (VoIP) number in an app, not a carrier line |
| 5 | Which senders can reach it? | Short codes, toll-free senders and foreign senders behave differently | US and Canadian senders. Texts from other countries usually cannot reach it |
| 6 | What does it need to work? | App numbers need internet and the right phone settings | Wi-Fi or mobile data. On iPhone, add the TripoSIM web app to your Home Screen. On Android, install the TripoSIM app |
| 7 | Is there an ID check, and when? | Some services check ID before you pick a number | Photo ID and a selfie, about 2 minutes, before you choose |
| 8 | What happens if you stop paying? | A released number can be given to someone else, along with your codes | Held 90 days (monthly) or 30 days (yearly), then released |
| 9 | Can you take the number with you if you leave? | Moving a number to another provider is not always possible | Check with TripoSIM before you depend on it |
| 10 | What does a full year cost, and what is the refund rule? | Teaser prices and add-ons hide the real cost | $100 a year or $12.99 a month. Not refunded, except non-delivery within 72 hours |
A few of these deserve a closer look.
Question 1, texting. “SMS included” can mean receive only. Ask the provider directly: “Can I reply from the same number?” If the answer is no and you need replies, look elsewhere. Our number-type comparison shows which categories include two-way texting.
Question 4, verification codes. Ask whether apps send their codes to the number. The TripoSIM number receives verification codes (OTP SMS) from apps, including WhatsApp and WhatsApp Business. TripoSIM tested 22 apps from October 3 to 18, 2026, and that list shows examples, not a limit. See the verification research for the list with dates.
Question 8, holds. This is the one people forget. If a number is released and reassigned, the next owner can receive texts meant for you. Before you let any number go, move your logins. The account security checklist for an expiring number walks through it.
How do you compare the full-year cost?
Add up twelve months, plus any extras you will really use.
For the TripoSIM number, paying monthly for a year comes to $155.88. The yearly plan is $100, which saves $55.88, about 36%. Yearly also includes a $5 welcome credit. If you need extra minutes twice a year, the yearly total is $110.
If you need the number for 7 months or fewer, monthly is cheaper. Run your own figures in the cost calculator.
When you compare other providers, check what the first-month price becomes on renewal, whether minutes or texts cost extra, and whether keeping the same number costs more.
When is the cheapest option the wrong one?
- Public “receive SMS online” pages. Anyone can read the inbox. Never use them for an account you care about.
- Free numbers for a long-term account. If the number is reclaimed after a quiet month, you lose the recovery route. See free and temporary US numbers vs paid.
- A personal number for a team. If several people must answer one line, you need a business phone system with shared lines and routing, not a personal app number.
Where does the TripoSIM number fit?
The TripoSIM US Virtual Number fits when your job is “be reachable on a US number from abroad”: US contacts call you, you call the US and Canada, and you receive texts from US senders. It also receives verification codes from apps, including WhatsApp. It does not fit when you need to text back, call emergency numbers, or call other countries. If that matches, see the plans. If it does not, the checklist above still works for whatever you choose instead.