Re: Samsung Galaxy S2 not sending SMS messages
Usually messages have no limit on the length, what normally happens is it sends the messages separately. But, then again, your network may have limitations on this so the phone's forced to convert to MMS, which uses data services.
For MMS to work, the settings have to be in order. Go to settings>wireless and network>mobile networks>access point names. Check what you have on there with your carrier. If all's well, make sure you have data network activated and try sending an MMS. It should work at that point.