Games4Mobile is a Payforit scam operated by Nexgenmobi.
The typical subscription message reads
“Thank you for Your free trial of Games4Mobile from Nexgen Ltd will end on 13/04/19. Then £4.50 per week until you text STOP to 64055. HELP? 02037403517”
The phone number given appears to be an answering service. There is a contact email address: email@example.com.
The company uses the 64055 shortcode operated by mGage Ltd and some consumers have reported success after asking them to intervene.