Calilio is a Voice over Internet Protocol (VoIP) platform that allows you to make and receive calls over the Internet. It offers high-quality voice communication, comparable to or better than traditional landline phone service.

How does Calilio work?

Calilio converts your voice into a digital signal that travels over the internet. You can make a call directly from a computer, a special VoIP phone, or a traditional phone connected to a special adapter.

Does VoIP use a SIM card?

A VoIP phone does not use a SIM card. It uses an internet connection to make and receive calls. VoIP phones can be used on any device with internet access, including a computer, smartphone, or a special VoIP phone.

Why should I use Calilio instead of traditional phone services?

Calilio offers several advantages over traditional phone services, including lower cost, increased mobility, and advanced features like voicemail-to-email, call forwarding, call monitoring, video conferencing, and more. Our cloud phone system support multiple users on a single account, making it ideal for businesses of all sizes. It also offers mobility, allowing employees to make and receive calls from anywhere, thereby improving communication and productivity.

How to buy a virtual phone number on Calilio?

Buying a virtual phone number on Calilio is easy. Simply sign into your account, go to the 'Virtual Number' section, choose the country and area code you want, and select your number. Once you've selected, follow the prompts to complete the purchase. These online phone numbers allows you to make and receive calls from from any device with an internet connection

Guidelines>SMS Guidelines>Czech Republic(CZ)

Guidelines

Czech Republic(CZ)

Locale Summary:

Locale name	Czech Republic
ISO code The International Organization for Standardization two character representation for the given locale.	CZ
Region	Europe
Mobile country code A three digit code associated with the given locale and used in conjunction with a Mobile Network Code to uniquely identify mobile networks.	230
Dialing code The dialing prefix used to establish a call or send an SMS from one locale to the given locale.	+420

Guidelines:

Two-way SMS supported Whether Calilio supports two-way SMS in the given locale.	Yes
Number portability available Whether number portability is available in the given locale.	Yes
Calilio concatenated message support Concatenation refers to the capability of splitting a message that is too long to be sent in one SMS into smaller pieces and then joining the pieces at the receiving end so that the receiver sees the message as one.	Yes For certain sender ID types this may not be supported. Where messages are split and rejoined may vary based on character encoding.
Message length How many characters can be sent given a particular message encoding before the message will be split into concatenated segments.	160 Characters
Calilio MMS support Multimedia Messaging Service (MMS) provides a standards-based means to send pictures and video to mobile phones.	Converted to SMS with embedded URL
Sending SMS to landline numbers How Calilio handles an SMS message destined for landline telephone number.	You cannot send SMS to a landline destination number: the Calilio REST API will throw a 400 response with error code 21614, the message will not appear in the logs, and the account will not be charged.
Compliance considerations Calilio strongly encourages customers to review proposed use cases with qualified legal counsel to make sure that they comply with all applicable laws. This table lists some general best practices.	Sender ID Compliance Sender ID Registration is required in Czech Republic for networks T-Mobile and O2. Starting on July 14, 2025, messages with unregistered Sender IDs to these networks will be blocked. To continue sending messages, you must use a registered Alphanumeric Sender ID. Delivery to M2M Numbers Message delivery to M2M numbers is on best effort basis only. Additional Phone Numbers and Sender ID Guidelines Calilio strongly encourages customers to review proposed use cases with qualified legal counsel to make sure that they comply with all applicable laws. The following are some general best practices: Get opt-in consent from each end user before sending any communication to them, particular for marketing or other non-essential communications. Only communicate during an end user's daytime hours unless it is urgent. SMS campaigns should support HELP/STOP messages, and similar messages, in the end user's local language. Do not contact end users on do-not-call or do-not-disturb registries.

Phone Numbers & Sender ID ( Alphanumeric)

	Global Pre-registration	Dynamic
Operator network capability Whether mobile operators in the given country support the feature.	Required for T-Mobile and O2 There is no segregation between International and Domestic Traffic	Not Supported for T-Mobile and O2 Supported for the rest of Czech Republic networks
Calilio supported Whether Calilio supports the feature for the given country.	Supported	Not Supported for T-Mobile and O2 networks Supported for the rest of Czech Republic networks Not Supported
Sender ID preserved In some countries sender IDs for certain sender types are not preserved and are changed for compliance and/or deliverability reasons. In these countries mobile subscribers will see a different ‘from sender ID’ than the one sent by you.	Yes	Yes for the networks that Dynamic Alphanumeric is supported
Provisioning time Provisioning is the process of getting the sender ID approved and registered with mobile networks (depending on country requirements). Provisioning time is how long this process takes in the given country.	3 weeks	N/A
UCS-2 support	Supported	Supported
Use case restrictions	N/A	The Czech Republic networks T-Mobile and O2 require Sender ID registration. We advise Calilio's customers to register an Alpha Sender ID in the Czech Republic for full country coverage.
Best practices	N/A	Use only registered Alphanumeric Sender ID in Czech Republic.

Long codes and short codes

	Long code domestic	Long code international	Short code
Operator network capability Whether mobile operators in the given country support the feature.	Supported	Not Supported	Supported
Calilio supported Whether Calilio supports the feature for the given country.	Supported	Not Supported for T-Mobile and O2 networks	Not Supported
Sender ID preserved In some countries sender IDs for certain sender types are not preserved and are changed for compliance and/or deliverability reasons. In these countries mobile subscribers will see a different ‘from sender ID’ than the one sent by you.	Yes	No	---

Enter the World of AI Business Phone System with Calilio

Improve your business operation with Calilio's advanced virtual phone system. Join today for a better way to connect.

4.6125+ Reviews16+ Badges