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.

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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>Bangladesh

Guidelines

Bangladesh

Locale Summary

Locale name	Bangladesh
ISO code The International Organization for Standardization two character representation for the given locale.	BD
Region	Asia
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.	470
Dialing code The dialing prefix used to establish a call or send an SMS from one locale to the given locale.	+880

Guidelines

Two-way SMS supported Whether Calilio supports two-way SMS in the given locale.	No
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.	-
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 Bangladesh for networks GrameenPhone, Robi/Axiata, and TeleTalk. Unregistered Sender IDs will be overwritten with a generic Alphanumeric Sender ID outside of the Calilio platform and delivery will be attempted on a best-effort basis only. The enforcement of complete blocking of unregistered Sender IDs in Bangladesh for networks GrameenPhone, Robi/Axiata, and TeleTalk is on September 08, 2025. Calilio highly recommends sending from a registered Alphanumeric Sender ID to avoid having your messages blocked. 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)

	International Pre-registration	Domestic Pre-registration	Dynamic
Operator network capability Whether mobile operators in the given country support the feature.	Required for Robi, Teletalk and Grameenphone	Required	Not Supported for GrameenPhone, Robi/Axiata, and TeleTalk Supported for the rest of Bangladesh networks
Calilio supported Whether Calilio supports the feature for the given country.	Required for Robi, Teletalk and Grameenphone	Not Supported	Not Supported for GrameenPhone, Robi/Axiata, and TeleTalk Supported for the rest of Bangladesh networks
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	N/A	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	N/A
UCS-2 support	Supported	N/A	Supported
Use case restrictions	N/A	N/A	-
Best practices	All customers sending SMS messages to Robi, Teletalk and Grameenphone must pre-register Alphanumeric Sender ID with Calilio	Customers with Domestic traffic are welcome to register their Sender IDs are International ones	Sender ID Registration is required for Bangladesh networks GrameenPhone, Robi/Axiata, and TeleTalk. Delivery via Dynamic Alphanumeric Sender ID will be attempted on a best-effort basis. The Sender ID will be overwritten with a generic Alphanumeric Sender ID outside the Calilio platform.

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.	Not Supported	Not Supported	Not Supported
Calilio supported Whether Calilio supports the feature for the given country	-	Not Supported for GrameenPhone, Robi/Axiata, and TeleTalk Supported for the rest of Bangladesh networks	-
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.	-	No	-

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