In the United Kingdom, both Dynamic numeric and alphanumeric senders are allowed. Short codes and long numbers are both allowed once you’ve registered your service.
The mobile networks in the UK all use the GSM character set. Unicode messages are supported.
Two Way Messaging
Two Way SMS is supported in the UK.
All operators in the UK support reliable handset delivery receipts for SMS.
SMS restrictions in United Kingdom
General restrictions apply to prevent abuse (spam, phishing, etc). The content of marketing messages must be appropriate to the intended audience and will not be likely to offend, upset or harm, etc, any recipient of the message, whether deliberately or otherwise. In this regard, you must comply with all applicable laws and industry standards that apply to the marketing to children.
SMS Marketing guidelines
When you collect customer details, you must get their permission if you want to send them other offers or promotions. Customers have the right to stop their information being used for direct marketing. You must make it easy to opt out by sending a ‘STOP’ text to a short number.
SMS-messages must clearly indicate who you are, that you’re selling something and what the promotions and conditions are.
No UK Government related senders, no Apple related senders and no O2 related senders are allowed.