International Call Rates Explained: Per Minute vs Per Second

The TripoSIM US Number charges calls abroad per started minute from your credit, with no connection fee, and calls nobody answers are free. Here is how that compares with the other ways calls are billed.

Two calling apps can both say "5 cents a minute" and still charge you very different amounts for the same call. The difference hides in the small print: rounding, fees and number types. This guide explains each one with worked examples, so you can compare offers properly.

1. The price per minute

This is the number every app advertises. It depends mostly on the country you call, and sometimes on the network or the kind of number.

2. Per-second vs per-minute billing

The billing increment decides how a call's length is turned into chargeable time. You'll often see it written as two numbers: the first block, then each block after it, in seconds.

Per-second billing is fairer for many short calls; per-minute billing is simpler to predict, and it is common for international calls. Neither is wrong, as long as it is clearly stated. Some apps don't show their billing increment at all, so look for it before you compare rates.

3. Connection fees and minimum charges

• A connection fee is charged once per call, however short. A calling card at $0.02 a minute with a $0.99 connection fee costs $1.01 for a one-minute call.
• A minimum charge bills short calls as if they lasted longer. Some operators charge at least one minute per international call.

For short calls (a hotel, a quick check-in with family) these fees can matter more than the rate. That's one reason a landline call abroad can cost more than you expect.

4. The type of number you call

• Mobile vs landline: in some countries, calling mobiles costs more than landlines.
• Different networks: some apps charge different prices for different mobile networks in the same country.
• Special numbers cost more: numbers that aren't tied to a place, personal numbers and some special ranges (for example in the UK) are often priced higher.
• Premium-rate and satellite numbers are very expensive and often blocked, to protect customers from fraud.

5. Calls that don't connect

Check whether you pay when nobody answers, when you hit voicemail, or when the line is busy. With most services, a voicemail that answers counts as an answered call.

Why are international calls expensive, and why do mobiles cost more?

Your call passes through several networks, and the network in the destination country charges a fee to connect it. Those fees differ a lot from country to country, and in many countries mobile networks charge more than landlines. Some governments also add charges on incoming international calls. That is why the price per minute can be very different from one country to the next.

Hidden costs checklist

Before you top up any calling app, check:

1. Is there a connection fee or a minimum charge?
2. Per second or per minute?
3. Does credit expire if you don't use it?
4. Does a plan renew or recharge automatically?
5. Does "unlimited" have a fair-use limit?
6. Are taxes or fees added at checkout?
7. Does your bank add a fee for paying in US dollars?
8. Is there a maximum length for one call?

How the TripoSIM US Number charges for calls abroad

Our rules for calls abroad:

• Per started minute, with no connection fee: a 2-minute-10-second call counts as 3 minutes.
• Unanswered calls are free. If the other person's voicemail answers, the call counts as answered.
• You see the price before every call: the keypad shows the country, the price per minute and how many minutes your credit covers.
• A call never costs more than your credit: it ends when your credit runs out.
• Up to $10 a day of calls to other countries, to protect your account.
• Destinations from $0.69 a minute open 7 days after your first payment, a common protection against fraud.
• Not available: sanctioned countries, premium-rate and satellite numbers, and emergency numbers.
• Calls to the US and Canada use the 300 minutes a month included in your plan, not your credit. +1 numbers in the Caribbean and US territories such as Puerto Rico are paid from credit.

Worked examples

How to compare two calling offers

1. Write down your usual call: country, mobile or landline, and how long it lasts.
2. Find each offer's price per minute for that exact number type.
3. Apply the billing rule: round your call up to the next second, 6 seconds or minute.
4. Add any connection fee and check the minimum charge.
5. Multiply by how many calls you make in a month, and add any monthly fee.
6. Check what happens to unused credit, then choose the cheapest total, not the cheapest rate.

Frequently asked questions

What is per-second billing?

You pay only for the seconds you talk, after any minimum. A 2-minute-10-second call is charged as 130 seconds. With per-minute billing, the same call is charged as 3 minutes.

Is per-minute billing a bad deal?

Not necessarily. It costs a little more on short calls, but it is simple to predict. What matters is the total: rate, rounding and fees together. Our rule is per started minute with no connection fee.

What does 60/60 billing mean?

The first block is 60 seconds and every block after it is 60 seconds: in other words, per started minute. 1/1 means per second, and 30/6 means a 30-second first block, then 6-second blocks.

Do I pay if nobody answers?

With the TripoSIM US Number, no: unanswered calls are free. If voicemail answers, the call counts as answered. Other services have their own rules, so check them.

Why do some numbers in the same country cost more?

Special ranges such as personal, premium or non-local numbers cost more to connect. Where a country's price says "from", some ranges cost more; the TripoSIM app shows the exact price before you call.

Why can't I call some countries or numbers?

We block sanctioned countries, premium-rate and satellite numbers to follow the law and protect customers from fraud. The TripoSIM US Number can't call emergency numbers: use a local mobile line.