I find content compression to help a lot on wireless connections. It can also save you a bundle while roaming.
For the geeks among us there is ViCompress (
http://www.visolve.com/vicompress/), a free Linux compression and caching proxy you can run along Asterisk on an old PC.
Those requiring plug and play solutions can always go to service providers such as Propel (
http://www.propel.com) which costs $8/month or $60/year.
VladS
Mobile phones: iPhone 5, Blackberry 9900, Nexus S, Samsung S3322 duos
Mobile data cards: Huawei E587u-5, Huawei E583c, Huawei E160
Postpaid SIMs: CA: Fido, Wind; INTL: Telna
Prepaid SIMs: DE: Fonic, Lidl; AT: yesss!, bob; UK: O2; US: AT&T; RO: Orange, Vodafone; FR: b&you, Lycamobile; NL: Lycamobile; BE: Lycamobile, Jim Mobile; CL: Entel; MX: Telcel; INTL: eKit Blue, eKit Yellow
Dead SIMs: too many to list